struts2入门教程三（上传与下载）
文件的上传与下载
上传
Servlet3.0的上传改进
HttpServletRequest增加了对文件上传的支持
Part getPart(String name)通过名称获取文件上传域
Collection
表单属性enctype,数据表单编码方式
application/x-www-form0urlencoded
multipart/form-data
text/plain
java 代码
package action;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collection;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
@MultipartConfig
public class uploadServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out=response.getWriter();
String fileName=request.getParameter("name");
Part part=request.getPart("file");
out.println("上传文件的类型："+part.getContentType()+"
");
out.println("上传文件的大小"+part.getSize()+"
");
Collection headerNames=part.getHeaderNames();
for(String headerName:headerNames){
out.println(headerName+"-->"+part.getHeader(headerName)+"
");
}
// 这里 路径为绝对路径 / 表示 的是 webroot 的 根路径
part.write(getServletContext().getRealPath("/uploadFiles")+"/"+fileName);
}
}
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
My JSP 'index.jsp' starting page
web.xml
upload2
upload
action.uploadServlet
upload
/uploadServlet
index.jsp
运行方式及结果
struts2单文件上传
java代码
package action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
private String title;
private File upload;
private String uploadContentType;
private String uploadFileName;
private String savePath;
public String upload()throws Exception{
FileInputStream fis=new FileInputStream(getUpload());
FileOutputStream fos=new FileOutputStream(getSavePath()+"\\"+getUploadFileName());
byte[] buffer=new byte[1024];
int len=0;
while((len=fis.read(buffer))>0){
fos.write(buffer,0,len);
}
fos.close();
fis.close();
return SUCCESS;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public File getUpload() {
return upload;
}
public void setUpload(File upload) {
this.upload = upload;
}
public String getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(String uploadContentType) {
this.uploadContentType = uploadContentType;
}
public String getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(String uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String getSavePath() {
// 返回 绝对路径
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
}struts.xml
/uploadFiles
/succ.jsp
/login.jsp
succ.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
My JSP 'index.jsp' starting page
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
上传成功!
文件标题:
文件为：
"/>
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
My JSP 'index.jsp' starting page
Struts 多文件上传
一：使用struts2自身的验证
java 代码
package action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
private String[] titles;
private File[] upload;
private String[] uploadContentType;
private String[] uploadFileName;
private String savePath;
private String allowTypes;
public String upload() throws Exception {
if (upload.length <= 0) {
return null;
}
for (int i = 0; i < upload.length; i++) {
FileInputStream fis = new FileInputStream(getUpload()[i]);
System.out.println(getUploadFileName());
FileOutputStream fos = new FileOutputStream(getSavePath() + "\\"
+ getUploadFileName()[i]);
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
fos.close();
fis.close();
}
return SUCCESS;
}
public boolean check(String type){
String[] types=allowTypes.split(",");
for (String s: types) {
if(s.equals(type)){
return true;
}
}
return false;
}
// public void validate(){
//
// for (String Type : uploadContentType) {
//
// boolean b=check(Type);
//
// if(!b){
// // 添加FieldError
// addFieldError("upload", "您要上传的文件类型不正确！"); }
// }
//
// }
//
public String[] getTitles() {
return titles;
}
public void setTitles(String[] titles) {
this.titles = titles;
}
public File[] getUpload() {
return upload;
}
public void setUpload(File[] upload) {
this.upload = upload;
}
public String[] getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(String[] uploadContentType) {
this.uploadContentType = uploadContentType;
}
public String[] getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(String[] uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String getSavePath() {
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
// 设计校验类型的 注入
public void setAllowTypes(String allowTypes) {
this.allowTypes = allowTypes;
}
/*
* // 返回 绝对路径 return
* ServletActionContext.getServletContext().getRealPath(savePath);
*/
}struts.xml
/uploadFiles
image/png,image/gif,image/jpg,image/jpeg
/succ.jsp
/index.jsp
image/png,image/gif,image/jpeg
2000
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
My JSP 'index.jsp' starting page
mess.properties---国际化的实现
struts.messages.error.file.too.large=\u4E0A\u4F20\u7684\u6587\u4EF6\u592A\u5927\u8D85\u8FC7\u89C4\u5B9A\u9650\u5236
struts.messages.error.content.type.not.allowed=\u4E0A\u4F20\u7684\u6587\u4EF6\u7C7B\u578B\u4E0D\u5141\u8BB8
struts.messages.error.uploading=\u4E0A\u4F20\u9519\u8BEF
二： 使用自定义的方式验证
java 代码
package action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
private String[] titles;
private File[] upload;
private String[] uploadContentType;
private String[] uploadFileName;
private String savePath;
private String allowTypes;
public String upload() throws Exception {
if (upload.length <= 0) {
return null;
}
for (int i = 0; i < upload.length; i++) {
FileInputStream fis = new FileInputStream(getUpload()[i]);
System.out.println(getUploadFileName());
FileOutputStream fos = new FileOutputStream(getSavePath() + "\\"
+ getUploadFileName()[i]);
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
fos.close();
fis.close();
}
return SUCCESS;
}
public boolean check(String type){
String[] types=allowTypes.split(",");
for (String s: types) {
if(s.equals(type)){
return true;
}
}
return false;
}
public void validate(){
for (String Type : uploadContentType) {
boolean b=check(Type);
if(!b){
// 添加FieldError
addFieldError("upload", "您要上传的文件类型不正确！"); }
}
}
public String[] getTitles() {
return titles;
}
public void setTitles(String[] titles) {
this.titles = titles;
}
public File[] getUpload() {
return upload;
}
public void setUpload(File[] upload) {
this.upload = upload;
}
public String[] getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(String[] uploadContentType) {
this.uploadContentType = uploadContentType;
}
public String[] getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(String[] uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String getSavePath() {
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
// 设计校验类型的 注入
public void setAllowTypes(String allowTypes) {
this.allowTypes = allowTypes;
}
}
struts.xml
/uploadFiles
image/png,image/gif,image/jpg,image/jpeg
/succ.jsp
/index.jsp
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
My JSP 'index.jsp' starting page
下载
struts的下载方式
struts2 的文件下载
java 代码
package action;
import java.io.InputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class DownAction extends ActionSupport {
//该属性可以在配置文件中动态指定该属性值
private String inputPath;
//依赖注入该属性值的setter方法
public void setInputPath(String value)
{
inputPath = value;
}
/*
定义一个返回InputStream的方法，
该方法将作为被下载文件的入口，
且需要配置stream类型结果时指定inputName参数，
inputName参数的值就是方法去掉get前缀、首字母小写的字符串
*/
public InputStream getTargetFile() throws Exception
{
//ServletContext提供getResourceAsStream()方法
//返回指定文件对应的输入流
return ServletActionContext.getServletContext()
.getResourceAsStream(inputPath);
}
}
struts.xml
配置一个action
\uploadFiles\扑克.png
image/png
targetFile
4096
filename="1110.jpg"
/index.jsp
下载页面
简单的超链接下载
只需要基本的一个访问链接即可