作者使用的框架为ureport2（基于java的spring引擎的报表框架）
image.png
可以看到我想修改的类被加入到了spring中管理
我们先来看看这个类的方法：
/*******************************************************************************
* Copyright 2017 Bstek
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
******************************************************************************/
package com.bstek.ureport.console.designer;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.apache.commons.io.IOUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import com.bstek.ureport.cache.CacheUtils;
import com.bstek.ureport.console.RenderPageServletAction;
import com.bstek.ureport.console.cache.TempObjectCache;
import com.bstek.ureport.console.exception.ReportDesignException;
import com.bstek.ureport.definition.ReportDefinition;
import com.bstek.ureport.dsl.ReportParserLexer;
import com.bstek.ureport.dsl.ReportParserParser;
import com.bstek.ureport.dsl.ReportParserParser.DatasetContext;
import com.bstek.ureport.export.ReportRender;
import com.bstek.ureport.expression.ErrorInfo;
import com.bstek.ureport.expression.ScriptErrorListener;
import com.bstek.ureport.parser.ReportParser;
import com.bstek.ureport.provider.report.ReportProvider;
/**
* @author Jacky.gao
* @since 2017年1月25日
*/
public class DesignerServletAction extends RenderPageServletAction {
private ReportRender reportRender;
private ReportParser reportParser;
private List reportProviders=new ArrayList();
@Override
public void execute(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method=retriveMethod(req);
if(method!=null){
invokeMethod(method, req, resp);
}else{
VelocityContext context = new VelocityContext();
context.put("contextPath", req.getContextPath());
resp.setContentType("text/html");
resp.setCharacterEncoding("utf-8");
Template template=ve.getTemplate("ureport-html/designer.html","utf-8");
PrintWriter writer=resp.getWriter();
template.merge(context, writer);
writer.close();
}
}
public void scriptValidation(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String content=req.getParameter("content");
ANTLRInputStream antlrInputStream=new ANTLRInputStream(content);
ReportParserLexer lexer=new ReportParserLexer(antlrInputStream);
CommonTokenStream tokenStream=new CommonTokenStream(lexer);
ReportParserParser parser=new ReportParserParser(tokenStream);
ScriptErrorListener errorListener=new ScriptErrorListener();
parser.removeErrorListeners();
parser.addErrorListener(errorListener);
parser.expression();
List infos=errorListener.getInfos();
writeObjectToJson(resp, infos);
}
public void conditionScriptValidation(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String content=req.getParameter("content");
ANTLRInputStream antlrInputStream=new ANTLRInputStream(content);
ReportParserLexer lexer=new ReportParserLexer(antlrInputStream);
CommonTokenStream tokenStream=new CommonTokenStream(lexer);
ReportParserParser parser=new ReportParserParser(tokenStream);
ScriptErrorListener errorListener=new ScriptErrorListener();
parser.removeErrorListeners();
parser.addErrorListener(errorListener);
parser.expr();
List infos=errorListener.getInfos();
writeObjectToJson(resp, infos);
}
public void parseDatasetName(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String expr=req.getParameter("expr");
ANTLRInputStream antlrInputStream=new ANTLRInputStream(expr);
ReportParserLexer lexer=new ReportParserLexer(antlrInputStream);
CommonTokenStream tokenStream=new CommonTokenStream(lexer);
ReportParserParser parser=new ReportParserParser(tokenStream);
parser.removeErrorListeners();
DatasetContext ctx=parser.dataset();
String datasetName=ctx.Identifier().getText();
Map result=new HashMap();
result.put("datasetName", datasetName);
writeObjectToJson(resp, result);
}
public void savePreviewData(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String content=req.getParameter("content");
content=decodeContent(content);
InputStream inputStream=IOUtils.toInputStream(content,"utf-8");
ReportDefinition reportDef=reportParser.parse(inputStream,"p");
reportRender.rebuildReportDefinition(reportDef);
IOUtils.closeQuietly(inputStream);
TempObjectCache.putObject(PREVIEW_KEY, reportDef);
}
public void loadReport(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file=req.getParameter("file");
if(file==null){
throw new ReportDesignException("Report file can not be null.");
}
file=ReportUtils.decodeFileName(file);
Object obj=TempObjectCache.getObject(file);
if(obj!=null && obj instanceof ReportDefinition){
ReportDefinition reportDef=(ReportDefinition)obj;
TempObjectCache.removeObject(file);
writeObjectToJson(resp, new ReportDefinitionWrapper(reportDef));
}else{
ReportDefinition reportDef=reportRender.parseReport(file);
writeObjectToJson(resp, new ReportDefinitionWrapper(reportDef));
}
}
public void deleteReportFile(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file=req.getParameter("file");
if(file==null){
throw new ReportDesignException("Report file can not be null.");
}
ReportProvider targetReportProvider=null;
for(ReportProvider provider:reportProviders){
if(file.startsWith(provider.getPrefix())){
targetReportProvider=provider;
break;
}
}
if(targetReportProvider==null){
throw new ReportDesignException("File ["+file+"] not found available report provider.");
}
targetReportProvider.deleteReport(file);
}
public void saveReportFile(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file=req.getParameter("file");
file=ReportUtils.decodeFileName(file);
String content=req.getParameter("content");
content=decodeContent(content);
ReportProvider targetReportProvider=null;
for(ReportProvider provider:reportProviders){
if(file.startsWith(provider.getPrefix())){
targetReportProvider=provider;
break;
}
}
if(targetReportProvider==null){
throw new ReportDesignException("File ["+file+"] not found available report provider.");
}
targetReportProvider.saveReport(file, content);
InputStream inputStream=IOUtils.toInputStream(content,"utf-8");
ReportDefinition reportDef=reportParser.parse(inputStream, file);
reportRender.rebuildReportDefinition(reportDef);
CacheUtils.cacheReportDefinition(file, reportDef);
IOUtils.closeQuietly(inputStream);
}
public void loadReportProviders(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
writeObjectToJson(resp, reportProviders);
}
public void setReportRender(ReportRender reportRender) {
this.reportRender = reportRender;
}
public void setReportParser(ReportParser reportParser) {
this.reportParser = reportParser;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext)throws BeansException {
super.setApplicationContext(applicationContext);
Collection providers=applicationContext.getBeansOfType(ReportProvider.class).values();
for(ReportProvider provider:providers){
if(provider.disabled() || provider.getName()==null){
continue;
}
reportProviders.add(provider);
}
}
@Override
public String url() {
return "/designer";
}
}
没错，作者我本人想修改ureport2的loadReport方法，因为框架中的下载文件名一直是ureport-p.xlsx，所以我想修改。
作者在这里提供2种方法，有一种方法是我工作的老大给的建议
1：我的思路
image.png
新建一个类和jar包类的方法一模一样，因为自己的代码的优先级高于maven依赖的版本
参考网址：https://blog.csdn.net/yw_1207/article/details/80828236
代码如下：
package com.sf.energy.nplatform.report.adapter;
import com.bstek.ureport.cache.CacheUtils;
import com.bstek.ureport.console.RenderPageServletAction;
import com.bstek.ureport.console.cache.TempObjectCache;
import com.bstek.ureport.console.designer.ReportDefinitionWrapper;
import com.bstek.ureport.console.designer.ReportUtils;
import com.bstek.ureport.console.exception.ReportDesignException;
import com.bstek.ureport.definition.ReportDefinition;
import com.bstek.ureport.dsl.ReportParserLexer;
import com.bstek.ureport.dsl.ReportParserParser;
import com.bstek.ureport.export.ReportRender;
import com.bstek.ureport.expression.ErrorInfo;
import com.bstek.ureport.expression.ScriptErrorListener;
import com.bstek.ureport.parser.ReportParser;
import com.bstek.ureport.provider.report.ReportProvider;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.apache.commons.io.IOUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.*;
/**
* @Author bi xuan
* @Date 1/27/2021 2:52 PM
* @Version 1.0
*/
public class DesignerServletAction extends RenderPageServletAction {
private ReportRender reportRender;
private ReportParser reportParser;
private List reportProviders=new ArrayList();
private String fileName;
public String getFileName() {
return fileName;
}
@Override
public void execute(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method=retriveMethod(req);
if(method!=null){
invokeMethod(method, req, resp);
}else{
VelocityContext context = new VelocityContext();
context.put("contextPath", req.getContextPath());
resp.setContentType("text/html");
resp.setCharacterEncoding("utf-8");
Template template=ve.getTemplate("ureport-html/designer.html","utf-8");
PrintWriter writer=resp.getWriter();
template.merge(context, writer);
writer.close();
}
}
public void scriptValidation(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String content=req.getParameter("content");
ANTLRInputStream antlrInputStream=new ANTLRInputStream(content);
ReportParserLexer lexer=new ReportParserLexer(antlrInputStream);
CommonTokenStream tokenStream=new CommonTokenStream(lexer);
ReportParserParser parser=new ReportParserParser(tokenStream);
ScriptErrorListener errorListener=new ScriptErrorListener();
parser.removeErrorListeners();
parser.addErrorListener(errorListener);
parser.expression();
List infos=errorListener.getInfos();
writeObjectToJson(resp, infos);
}
public void conditionScriptValidation(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String content=req.getParameter("content");
ANTLRInputStream antlrInputStream=new ANTLRInputStream(content);
ReportParserLexer lexer=new ReportParserLexer(antlrInputStream);
CommonTokenStream tokenStream=new CommonTokenStream(lexer);
ReportParserParser parser=new ReportParserParser(tokenStream);
ScriptErrorListener errorListener=new ScriptErrorListener();
parser.removeErrorListeners();
parser.addErrorListener(errorListener);
parser.expr();
List infos=errorListener.getInfos();
writeObjectToJson(resp, infos);
}
public void parseDatasetName(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String expr=req.getParameter("expr");
ANTLRInputStream antlrInputStream=new ANTLRInputStream(expr);
ReportParserLexer lexer=new ReportParserLexer(antlrInputStream);
CommonTokenStream tokenStream=new CommonTokenStream(lexer);
ReportParserParser parser=new ReportParserParser(tokenStream);
parser.removeErrorListeners();
ReportParserParser.DatasetContext ctx=parser.dataset();
String datasetName=ctx.Identifier().getText();
Map result=new HashMap();
result.put("datasetName", datasetName);
writeObjectToJson(resp, result);
}
public void savePreviewData(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String content=req.getParameter("content");
content=decodeContent(content);
InputStream inputStream= IOUtils.toInputStream(content,"utf-8");
ReportDefinition reportDef=reportParser.parse(inputStream,"p");
reportRender.rebuildReportDefinition(reportDef);
IOUtils.closeQuietly(inputStream);
TempObjectCache.putObject(PREVIEW_KEY, reportDef);
}
public void loadReport(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file=req.getParameter("file");
if(file==null){
throw new ReportDesignException("Report file can not be null.");
}
//备注file不能修改，调试源码时发现这个loadReport被调用了两次，第一次是加载整个报表界面使用，第二次是加载报表列表使用,改了就会报错
file= ReportUtils.decodeFileName(file);
this.fileName = file;
// this.fileName = this.fileName.replace("file:","").split(".")[0];
this.fileName = this.fileName.replace("file:","").split("\\.")[0];
Object obj=TempObjectCache.getObject(file);
if(obj!=null && obj instanceof ReportDefinition){
ReportDefinition reportDef=(ReportDefinition)obj;
TempObjectCache.removeObject(file);
writeObjectToJson(resp, new ReportDefinitionWrapper(reportDef));
}else{
ReportDefinition reportDef=reportRender.parseReport(file);
writeObjectToJson(resp, new ReportDefinitionWrapper(reportDef));
}
}
public void deleteReportFile(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file=req.getParameter("file");
if(file==null){
throw new ReportDesignException("Report file can not be null.");
}
ReportProvider targetReportProvider=null;
for(ReportProvider provider:reportProviders){
if(file.startsWith(provider.getPrefix())){
targetReportProvider=provider;
break;
}
}
if(targetReportProvider==null){
throw new ReportDesignException("File ["+file+"] not found available report provider.");
}
targetReportProvider.deleteReport(file);
}
public void saveReportFile(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file=req.getParameter("file");
file=ReportUtils.decodeFileName(file);
String content=req.getParameter("content");
content=decodeContent(content);
ReportProvider targetReportProvider=null;
for(ReportProvider provider:reportProviders){
if(file.startsWith(provider.getPrefix())){
targetReportProvider=provider;
break;
}
}
if(targetReportProvider==null){
throw new ReportDesignException("File ["+file+"] not found available report provider.");
}
targetReportProvider.saveReport(file, content);
InputStream inputStream=IOUtils.toInputStream(content,"utf-8");
ReportDefinition reportDef=reportParser.parse(inputStream, file);
reportRender.rebuildReportDefinition(reportDef);
CacheUtils.cacheReportDefinition(file, reportDef);
IOUtils.closeQuietly(inputStream);
}
public void loadReportProviders(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
writeObjectToJson(resp, reportProviders);
}
public void setReportRender(ReportRender reportRender) {
this.reportRender = reportRender;
}
public void setReportParser(ReportParser reportParser) {
this.reportParser = reportParser;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext)throws BeansException {
super.setApplicationContext(applicationContext);
Collection providers=applicationContext.getBeansOfType(ReportProvider.class).values();
for(ReportProvider provider:providers){
if(provider.disabled() || provider.getName()==null){
continue;
}
reportProviders.add(provider);
}
}
@Override
public String url() {
return "/designer";
}
}
然后将其加入到spring管理中，我这里使用的和框架一样的方式，使用xml的bean标签加入到xml中
修改的代码：
之前的calss为jar包里类的reference。
由于jvm的加载优先级问题，就会找bean的id找到我们的类进行实例化加到bean，替代了框架里的类。
到此我们思路结束了。
2：我工作老大的思路
image.png
新建一个adapter类
代码如下：
package com.sf.energy.nplatform.report.adapter;
import com.bstek.ureport.cache.CacheUtils;
import com.bstek.ureport.console.RenderPageServletAction;
import com.bstek.ureport.console.cache.TempObjectCache;
import com.bstek.ureport.console.designer.DesignerServletAction;
import com.bstek.ureport.console.designer.ReportDefinitionWrapper;
import com.bstek.ureport.console.designer.ReportUtils;
import com.bstek.ureport.console.exception.ReportDesignException;
import com.bstek.ureport.definition.ReportDefinition;
import com.bstek.ureport.dsl.ReportParserLexer;
import com.bstek.ureport.dsl.ReportParserParser;
import com.bstek.ureport.export.ReportRender;
import com.bstek.ureport.expression.ErrorInfo;
import com.bstek.ureport.expression.ScriptErrorListener;
import com.bstek.ureport.parser.ReportParser;
import com.bstek.ureport.provider.report.ReportProvider;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.apache.commons.io.IOUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.*;
/**
* @Author bi xuan
* @Date 2021/1/13 18:19
* @Version 1.0
*/
//@Component
public class DesignerServletActionAdapter extends RenderPageServletAction {
// @Autowired
private ReportRender reportRender;
// @Autowired
private ReportParser reportParser;
private List reportProviders=new ArrayList();
private String fileName;
public String getFileName() {
return fileName;
}
@Override
public void execute(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method=retriveMethod(req);
if(method!=null){
invokeMethod(method, req, resp);
}else{
VelocityContext context = new VelocityContext();
context.put("contextPath", req.getContextPath());
resp.setContentType("text/html");
resp.setCharacterEncoding("utf-8");
Template template=ve.getTemplate("ureport-html/designer.html","utf-8");
PrintWriter writer=resp.getWriter();
template.merge(context, writer);
writer.close();
}
}
public void scriptValidation(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String content=req.getParameter("content");
ANTLRInputStream antlrInputStream=new ANTLRInputStream(content);
ReportParserLexer lexer=new ReportParserLexer(antlrInputStream);
CommonTokenStream tokenStream=new CommonTokenStream(lexer);
ReportParserParser parser=new ReportParserParser(tokenStream);
ScriptErrorListener errorListener=new ScriptErrorListener();
parser.removeErrorListeners();
parser.addErrorListener(errorListener);
parser.expression();
List infos=errorListener.getInfos();
writeObjectToJson(resp, infos);
}
public void conditionScriptValidation(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String content=req.getParameter("content");
ANTLRInputStream antlrInputStream=new ANTLRInputStream(content);
ReportParserLexer lexer=new ReportParserLexer(antlrInputStream);
CommonTokenStream tokenStream=new CommonTokenStream(lexer);
ReportParserParser parser=new ReportParserParser(tokenStream);
ScriptErrorListener errorListener=new ScriptErrorListener();
parser.removeErrorListeners();
parser.addErrorListener(errorListener);
parser.expr();
List infos=errorListener.getInfos();
writeObjectToJson(resp, infos);
}
public void parseDatasetName(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String expr=req.getParameter("expr");
ANTLRInputStream antlrInputStream=new ANTLRInputStream(expr);
ReportParserLexer lexer=new ReportParserLexer(antlrInputStream);
CommonTokenStream tokenStream=new CommonTokenStream(lexer);
ReportParserParser parser=new ReportParserParser(tokenStream);
parser.removeErrorListeners();
ReportParserParser.DatasetContext ctx=parser.dataset();
String datasetName=ctx.Identifier().getText();
Map result=new HashMap();
result.put("datasetName", datasetName);
writeObjectToJson(resp, result);
}
public void savePreviewData(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String content=req.getParameter("content");
content=decodeContent(content);
InputStream inputStream= IOUtils.toInputStream(content,"utf-8");
ReportDefinition reportDef=reportParser.parse(inputStream,"p");
reportRender.rebuildReportDefinition(reportDef);
IOUtils.closeQuietly(inputStream);
TempObjectCache.putObject(PREVIEW_KEY, reportDef);
}
public void loadReport(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file=req.getParameter("file");
if(file==null){
throw new ReportDesignException("Report file can not be null.");
}
//备注file不能修改，调试源码时发现这个loadReport被调用了两次，第一次是加载整个报表界面使用，第二次是加载报表列表使用,改了就会报错
file= ReportUtils.decodeFileName(file);
this.fileName = file;
// this.fileName = this.fileName.replace("file:","").split(".")[0];
this.fileName = this.fileName.replace("file:","").split("\\.")[0];
Object obj=TempObjectCache.getObject(file);
if(obj!=null && obj instanceof ReportDefinition){
ReportDefinition reportDef=(ReportDefinition)obj;
TempObjectCache.removeObject(file);
writeObjectToJson(resp, new ReportDefinitionWrapper(reportDef));
}else{
ReportDefinition reportDef=reportRender.parseReport(file);
writeObjectToJson(resp, new ReportDefinitionWrapper(reportDef));
}
}
public void deleteReportFile(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file=req.getParameter("file");
if(file==null){
throw new ReportDesignException("Report file can not be null.");
}
ReportProvider targetReportProvider=null;
for(ReportProvider provider:reportProviders){
if(file.startsWith(provider.getPrefix())){
targetReportProvider=provider;
break;
}
}
if(targetReportProvider==null){
throw new ReportDesignException("File ["+file+"] not found available report provider.");
}
targetReportProvider.deleteReport(file);
}
public void saveReportFile(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String file=req.getParameter("file");
file=ReportUtils.decodeFileName(file);
String content=req.getParameter("content");
content=decodeContent(content);
ReportProvider targetReportProvider=null;
for(ReportProvider provider:reportProviders){
if(file.startsWith(provider.getPrefix())){
targetReportProvider=provider;
break;
}
}
if(targetReportProvider==null){
throw new ReportDesignException("File ["+file+"] not found available report provider.");
}
targetReportProvider.saveReport(file, content);
InputStream inputStream=IOUtils.toInputStream(content,"utf-8");
ReportDefinition reportDef=reportParser.parse(inputStream, file);
reportRender.rebuildReportDefinition(reportDef);
CacheUtils.cacheReportDefinition(file, reportDef);
IOUtils.closeQuietly(inputStream);
}
public void loadReportProviders(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
writeObjectToJson(resp, reportProviders);
}
public void setReportRender(ReportRender reportRender) {
this.reportRender = reportRender;
}
public void setReportParser(ReportParser reportParser) {
this.reportParser = reportParser;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext)throws BeansException {
super.setApplicationContext(applicationContext);
Collection providers=applicationContext.getBeansOfType(ReportProvider.class).values();
for(ReportProvider provider:providers){
if(provider.disabled() || provider.getName()==null){
continue;
}
reportProviders.add(provider);
}
}
@Override
public String url() {
return "/designer";
}
}
然后修改自己的xml
哈哈，你可能发现这不是一模一样吗？
其实我厚着脸皮承认其实都是我工作老大给的思路，
接下来是前方高能：作者自己的思路
因为我才毕业半年，在我接触到Java时就是springboot了，我不喜欢xml文件，所以我要用注解
image.png
xml注释掉
image.png
抱着好奇的心态run了一下，可以，这时开始头脑一片问号
@Autowired注解是根据byType进行加载的
这明显我的type是DesignerServletActionAdapter，jar包的是DesignServletAction，这类型都不同，是怎么替换的啊！
我决定查看调用栈一探究竟
image.png
image.png
image.png
image.png
image.png
没错。他是根据url这个方法来获取类的！(其实这里还是有一个疑惑，因为我重写的类的方法返回的还是/desinger,难到是因为我写的优先级方法高吗？)
image.png
判断url的源码为：
/*******************************************************************************
* Copyright 2017 Bstek
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
******************************************************************************/
package com.bstek.ureport.console;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
/**
* @author Jacky.gao
* @since 2017年1月25日
*/
public class UReportServlet extends HttpServlet {
private static final long serialVersionUID = 533049461276487971L;
public static final String URL = "/ureport";
private Map actionMap = new HashMap();
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
WebApplicationContext applicationContext = getWebApplicationContext(config);
Collection handlers = applicationContext.getBeansOfType(ServletAction.class).values();
for (ServletAction handler : handlers) {
String url = handler.url();
if (actionMap.containsKey(url)) {
throw new RuntimeException("Handler [" + url + "] already exist.");
}
actionMap.put(url, handler);
}
}
protected WebApplicationContext getWebApplicationContext(ServletConfig config){
return WebApplicationContextUtils.getWebApplicationContext(config.getServletContext());
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String path = req.getContextPath() + URL;
String uri = req.getRequestURI();
String targetUrl = uri.substring(path.length());
if (targetUrl.length() < 1) {
outContent(resp, "Welcome to use ureport,please specify target url.");
return;
}
int slashPos = targetUrl.indexOf("/", 1);
if (slashPos > -1) {
targetUrl = targetUrl.substring(0, slashPos);
}
ServletAction targetHandler = actionMap.get(targetUrl);
if (targetHandler == null) {
outContent(resp, "Handler [" + targetUrl + "] not exist.");
return;
}
RequestHolder.setRequest(req);
try{
targetHandler.execute(req, resp);
}catch(Exception ex){
resp.setCharacterEncoding("UTF-8");
PrintWriter pw=resp.getWriter();
Throwable e=buildRootException(ex);
resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
String errorMsg = e.getMessage();
if(StringUtils.isBlank(errorMsg)){
errorMsg=e.getClass().getName();
}
pw.write(errorMsg);
pw.close();
throw new ServletException(ex);
}finally{
RequestHolder.clean();
}
}
private Throwable buildRootException(Throwable throwable){
if(throwable.getCause()==null){
return throwable;
}
return buildRootException(throwable.getCause());
}
private void outContent(HttpServletResponse resp, String msg) throws IOException {
resp.setContentType("text/html");
PrintWriter pw = resp.getWriter();
pw.write("");
pw.write("UReport Console