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上传文件form表单enctype="multipart/form-data"传值解决办法（代原代码）

2014-12-10 17:31 756 查看

最近做的一个项目里遇到一个问题，就是如何在上传文件的表单里传递其它的变量，因为一但form表单用了enctype="multipart/form-data"类型后，所有的值都是以二进制进行传递的，所以当我们想取出这个表单里传递过来的其它变量的时候，就会遇到一个问题，那就是用request取不到传递过来的变量。在网上找了很多资料，也都是大至说一下，在这里我就借花献佛发个完整的原代码解决这个问题!!!

工程目录如下：

两个jar可以去apache上下载:
http://commons.apache.org/fileupload/
http://commons.apache.org/io/

四个文件原代码分别为：

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>fileUpload</servlet-name>
<servlet-class>servlet.FileUpload</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>fileUpload</servlet-name>
<url-pattern>/fileUpload</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>servlet.EncodeFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<listener>
<listener-class>
org.apache.commons.fileupload.servlet.FileCleanerCleanup
</listener-class>
</listener>
<listener>
<listener-class>
org.apache.commons.fileupload.servlet.FileCleanerCleanup
</listener-class>
</listener>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<form action="<%=path %>/fileUpload" method="post" enctype="multipart/form-data">
文件:
<input type="file" name="file">
姓名:
<input name="name" />
<input type="hidden" name="add" value="深圳"/>
<input type="submit">
</form>
</body>
</html>

success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'success.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">


</head>

<body>
user.name=${user.name}<br>
user.add=${user.add}<br>
file:=<a href="${affix.affixUrl}">${affix.affixName}</a>
</body>
</html>

Affix.java

package model;

import java.util.Date;

public class Affix {

private String tableName;

private Long tableRecordId;

private String affixName;

private String affixUrl;

private long size;

private long creatorId;

private Date createDate;

private Long updaterId;

private Date updatorDate;

public String getTableName() {
return tableName;
}

public void setTableName(String tableName) {
this.tableName = tableName;
}

public Long getTableRecordId() {
return tableRecordId;
}

public void setTableRecordId(Long tableRecordId) {
this.tableRecordId = tableRecordId;
}

public String getAffixName() {
return affixName;
}

public void setAffixName(String affixName) {
this.affixName = affixName;
}

public String getAffixUrl() {
return affixUrl;
}

public void setAffixUrl(String affixUrl) {
this.affixUrl = affixUrl;
}

public long getSize() {
return size;
}

public void setSize(long l) {
this.size = l;
}

public long getCreatorId() {
return creatorId;
}

public void setCreatorId(long creatorId) {
this.creatorId = creatorId;
}

public Date getCreateDate() {
return createDate;
}

public void setCreateDate(Date createDate) {
this.createDate = createDate;
}

public Long getUpdaterId() {
return updaterId;
}

public void setUpdaterId(Long updaterId) {
this.updaterId = updaterId;
}

public Date getUpdatorDate() {
return updatorDate;
}

public void setUpdatorDate(Date updatorDate) {
this.updatorDate = updatorDate;
}

}

User.java

package model;

public class User {

private String name;

private String add;

private int age;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getAdd() {
return add;
}

public void setAdd(String add) {
this.add = add;
}

public int getAge() {
return age;
}

public void setAge(int i) {
this.age = i;
}

}

EncodeFilter.java

package servlet;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class EncodeFilter implements Filter {

private String encoding = null;

public void destroy() {
encoding = null;
}

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterChain) throws IOException, ServletException {
if (encoding != null)
request.setCharacterEncoding(encoding);
filterChain.doFilter(request, response);
}

public void init(FilterConfig filterConfig) throws ServletException {
encoding = filterConfig.getInitParameter("encoding");
}

}

FileUpload.java

package servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import model.Affix;
import model.User;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUpload extends HttpServlet {

protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String tempPath = "d:\\file\\";
File file = new File(tempPath);
if(!file.exists()){
file.mkdir();
}

System.out.println(ServletFileUpload.isMultipartContent(request));
DiskFileItemFactory factory = new DiskFileItemFactory();
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);

// upload.setSizeMax(1024 * 1024 * 50L);
// Parse the request
List items = null;
try {

items = upload.parseRequest(request);
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
byte data[] = new byte[1024];
int i = 0;
Affix affix = null;
User user = new User();
if (items != null)
for (Iterator iterator = items.iterator(); iterator.hasNext();) {
FileItem item = (FileItem) iterator.next();

if (item.isFormField()) {
System.out.print(new String(item.getString("UTF-8")));
if ("add".equals(item.getFieldName())) {
user.setAdd(new String(item.getString("UTF-8")));
} else if ("name".equals(item.getFieldName())) {
user.setName(new String(item.getString("UTF-8")));
} else if ("age".equals(item.getFieldName())) {
user.setAge(Integer.parseInt(item.getString()));
}

// BeanUtils.setFieldValue(user, item.getFieldName(), item
// .getString());

} else {
String fileName = item.getName().substring(
item.getName().lastIndexOf(File.separator) + 1,
item.getName().length());
InputStream inputStream = item.getInputStream();
// InputStream inputStream = request.getInputStream();
OutputStream outputStream = new FileOutputStream(tempPath
+ fileName);
while ((i = inputStream.read(data)) != -1) {
outputStream.write(data, 0, i);
}
inputStream.close();
outputStream.close();
affix = new Affix();
affix.setCreateDate(new Date());
affix.setTableName("t_test_user");
affix.setSize(item.getSize());
affix.setAffixUrl(tempPath + fileName);
affix.setAffixName(fileName);
}
}

// userService.addUser(user);
// fileService.addFile(file)
request.setAttribute("user", user);
request.setAttribute("affix", affix);
request.getRequestDispatcher("/success.jsp").forward(request, response);
// response.sendRedirect("success.jsp");
}
}

代码有点乱，工作有点忙在这里就不改了。

执行结果如图：

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