Struts2 文件上传
struts文件上传,获取文件名和文件类型
/**
Action中还有两个属性:uploadFileName和uploadContentType,这两个属性分别用于封装上传文件的文件名、文件类型。这是Struts2设计的独到之处:Strut2的Action类直接通过File类型属性直接封装了上传文件的文件内容,但这个File属性无法获取上传文件的文件名和文件类型,所以Struts2就直接将文件域中包含的上传文件名和文件类型的信息封装到uploadFileName和 uploadContentType属性中,也就是说Struts2针对表单中名为xxx的文件域,在对应的Action类中使用3个属性来封装该文件域信息:
l 类型为File的xxx属性:用来封装页面文件域对应的文件内容。
l 类型为String的xxxFileName属性:用来封装该文件域对应的文件的文件名。
l 类型为String的xxxContentType属性:用来封装该文件域应用的文件的文件类型。
**/
package com.huawei.lifeservice.home.web;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import javax.servlet.ServletContext;
import org.apache.struts2.ServletActionContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.opensymphony.xwork2.ActionContext;
public class FileUploadAction extends BaseAction
{
private static final long serialVersionUID = 4668957692981296279L;
private static Logger logger = LoggerFactory.getLogger(FileUploadAction.class);
/**
* 图片文件
*/
private static final String FILE_DOT = ".";
/**
* 上传文件存放路径
*/
private final static String UPLOADDIR = "/upload";
/**
* 文件类型对应的存储位置
*/
private static final Map<String, String> map = new HashMap<String, String>();
static
{
map.put("image/png", "pic");
map.put("image/jpeg", "pic");
map.put("image/gif", "pic");
map.put("text/html", "page");
}
/**
* 上传文件集合
*/
private List<File> file;
/**
* 上传文件名集合
*/
private List<String> fileFileName;
/**
* 上传文件内容类型集合
*/
private List<String> fileContentType;
public List<File> getFile()
{
return file;
}
public void setFile(List<File> file)
{
this.file = file;
}
public List<String> getFileFileName()
{
return fileFileName;
}
public void setFileFileName(List<String> fileFileName)
{
this.fileFileName = fileFileName;
}
public List<String> getFileContentType()
{
return fileContentType;
}
public void setFileContentType(List<String> fileContentType)
{
this.fileContentType = fileContentType;
}
public String execute()
{
return "success";
}
public void process()
{
String imageUrl = null;
for (int i = 0; i < file.size(); i++)
{
imageUrl = uploadFile(i);
}
Map<String, String> map = new HashMap<String, String>();
map.put("url", imageUrl);
ClientWriter.write2Client(response, map);
}
public String generateFileName(String fileType)
{
String fileName = UUID.randomUUID().toString();
fileName = fileName.replaceAll("-", "");
if (map.containsKey(fileType))
{
// map.get(fileType);
fileType = fileType.substring(fileType.lastIndexOf("/"));
fileType = fileType.replaceAll("\\/", FILE_DOT);
}
else
{
logger.info("file type no exists...");
fileType = FILE_DOT + "unknown";
}
return fileName += fileType;
}
@SuppressWarnings("deprecation")
public String getSavePath(String fileType)
{
String dir = ServletActionContext.getRequest().getRealPath(UPLOADDIR);
logger.info("file save dir is " + dir);
String path = File.separator;
if (map.containsKey(fileType))
{
path += map.get(fileType) + File.separator;
}
return dir + path;
}
private String uploadFile(int i)
{
String fileName = null;
String savePath = null;
String fileContentType = null;
try
{
InputStream in = new FileInputStream(file.get(i));
fileContentType = this.getFileContentType().get(i);
logger.info("file content type is " + fileContentType);
fileName = generateFileName(fileContentType);
savePath = getSavePath(fileContentType);
File uploadFile = new File(savePath + fileName);
OutputStream out = new FileOutputStream(uploadFile);
byte[] buffer = new byte[1024 * 1024];
int length = 0;
while ((length = in.read(buffer)) > 0)
{
out.write(buffer, 0, length);
}
in.close();
out.close();
}
catch (FileNotFoundException e)
{
logger.error("file not found error", e);
}
catch (IOException e)
{
logger.error("io error", e);
}
String accessUrl = getAccessUrl(fileContentType) + fileName;
return accessUrl;
}
public void getWebRootPath()
{
ActionContext context = ActionContext.getContext();
ServletContext sc = (ServletContext)context.get(ServletActionContext.SERVLET_CONTEXT);
String contextPath = sc.getContextPath();
logger.info("contextPath is" + contextPath);
ActionContext.getContext().get(ServletActionContext.SERVLET_CONTEXT);
String temp = ServletActionContext.getServletContext().getContextPath();
System.err.println(temp);
SimpleResp<Object> simple = new SimpleResp<Object>();
simple.setData("ok");
simple.setResult(new Result(ReturnCode.PARAM_EPT));
ClientWriter.write2Client(response, simple);
}
public String getWebApplicationRoot()
{
ActionContext ac = ActionContext.getContext();
ServletContext sc = (ServletContext)ac.get(ServletActionContext.SERVLET_CONTEXT);
String contextPath = sc.getContextPath();
return contextPath;
}
public String getAccessUrl(String fileType)
{
String webRoot = getWebApplicationRoot();
String path = File.separator;
if (map.containsKey(fileType))
{
path += map.get(fileType);
}
String accessUrl = webRoot + UPLOADDIR + path + File.separator;
accessUrl = accessUrl.replaceAll("\\\\", "/");
return accessUrl;
}
}