Question

如何在spring mvc中上传图片并显示出来

Answer 1

可以使用组件上传JspSmartUpload.这是一个类.
<form name="f1" id="f1" action="/demo/servlet/UploadServlet" method="post" enctype="multipart/form-data">
<table border="0">
<tr>
<td>用户名:</td>
<td><input type="text" name="username" id="username"></td>
</tr>
<tr>
<td>密码:</td>
<td><input type="password" name="password" id="password"></td>
</tr>
<tr>
<td>相片:</td>
<td><input type="file" name="pic" id="pic"></td>
</tr>
<tr>
<td>相片:</td>
<td><input type="file" name="pic2" id="pic2"></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit"></td>
</tr>
</table>
</form>
这里直接通过表单提交给servlet访问,spring中的话需要配置(一般就不用servlet了,自行配置).
以上在JSp页面中,以下是servlet/action中的代码,由于采用了spring框架,怎么做你知道的(没有servlet但是有action).

package com.demo.servlet;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;
import java.util.UUID;

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

import com.jspsmart.upload.File;
import com.jspsmart.upload.Files;
import com.jspsmart.upload.Request;
import com.jspsmart.upload.SmartUpload;

public class UploadServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

SmartUpload su = new SmartUpload();
//初始化
su.initialize(this.getServletConfig(), request, response);

try {

//限制格式
//只允许哪几种格式
su.setAllowedFilesList("jpg,JPG,png,PNG,bmp,gif,GIF");
//不允许哪几种格式上传,不允许exe,bat及无扩展名的文件类型
//su.setDeniedFilesList("exe,bat,,");
//限制大小,每个上传的文件大小都不能大于100K
su.setMaxFileSize(100*1024);
//上传文件的总大小不能超过100K
//su.setTotalMaxFileSize(100*1024);
//上传
su.upload();

//唯一文件名
//得到文件集合
Files files = su.getFiles();
for(int i=0;i<files.getCount();i++)
{
//获得每一个上传文件
File file = files.getFile(i);
//判断客户是否选择了文件
if(file.isMissing())
{
continue;
}
//唯一名字
Random rand = new Random();
//String fileName = System.currentTimeMillis()+""+rand.nextInt(100000)+"."+file.getFileExt();
String fileName = UUID.randomUUID()+"."+file.getFileExt();

//以当前日期作为文件夹
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String dirPath = sdf.format(new Date());
//获得物理路径
String realDirPath= this.getServletContext().getRealPath(dirPath);
java.io.File dirFile = new java.io.File(realDirPath);
//判断是否存在
if(!dirFile.exists())
{
//创建文件夹
dirFile.mkdir();
}

//保存
file.saveAs("/"+dirPath+"/"+fileName);
//file.saveAs("/uploadFiles/"+fileName);
}

//原名保存
//su.save("/uploadFiles");
} catch (Exception e) {
System.out.println("格式错误");
}

//获得用户名
Request req = su.getRequest();
String username = req.getParameter("username");
System.out.println(username);

}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

this.doGet(request, response);
}

}
特别注意导的包是JspSmartUpload中的还是java.io.*中的.
再次说明,这段代码是servlet中的,spring中的action可以剪切以上的一部分.请自行调整.
希望能够帮助你.

Answer 2