HttpClient上传、接收图片

转载于：http://jingtaohailang.blog.51cto.com/8862159/1544821

感谢博主: 惊涛骇浪

正文：

1、客户端：
用到的jar包有：
commons-codec-1.3.jar
commons-httpclient.jar
commons-logging1.1.jar

代码：
package com.httpclient;

import java.io.File;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.multipart.FilePart;
import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;
public class Hclient {
public static void main(String args[]) {
String targetURL = null; //– 指定URL
File targetFile = null; //– 指定上传文件
targetFile = new File(“E:\1.jpg”);
targetURL = “http://localhost:7081/sendmessa/testServlet“; // servleturl
PostMethod filePost = new PostMethod(targetURL);
try {
//通过以下方法可以模拟页面参数提交
//filePost.setParameter(“name”, “中文”);
//filePost.setParameter(“pass”, “1234”);
Part[] parts = { new FilePart(targetFile.getName(), targetFile) };
filePost.setRequestEntity(new MultipartRequestEntity(parts, filePost.getParams()));
HttpClient client = new HttpClient();
client.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
int status = client.executeMethod(filePost);
if (status == HttpStatus.SC_OK) {
System.out.println(“上传成功”);// 上传成功
} else {
System.out.println(“上传失败”);// 上传失败
}
} catch (Exception ex) {
ex.printStackTrace();
} finally {
filePost.releaseConnection();
}
}
}

2、服务器端：
新建Web Project，工程名：netWorkServer。在src文件夹下创建com.httpclient的Package，在该包下创建名为TestServlets的Servlet。
用到的jar包是：commons-fileupload.jar。代码如下：

代码：
package com.httpclient;

import java.io.File;
import java.io.IOException;
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 org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class TestServlets extends HttpServlet {
private static final long serialVersionUID = 1L;
private String uploadPath = “d:\temp”; // 上传文件的目录
private String tempPath = “d:\temp\buffer\”; //临时文件目录
File tempPathFile;
public void init() throws ServletException {
File uploadFile = new File(uploadPath);
if (!uploadFile.exists()) {
uploadFile.mkdirs();
}

    File tempPathFile = new File(tempPath);    if (!tempPathFile.exists()) {        tempPathFile.mkdirs();    }}@SuppressWarnings("unchecked")public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {    try {        // Create a factory for disk-based file items        DiskFileItemFactory factory = new DiskFileItemFactory();        // Set factory constraints        factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb        factory.setRepository(tempPathFile);// 设置缓冲区目录        // Create a new file upload handler        ServletFileUpload upload = new ServletFileUpload(factory);        // Set overall request size constraint        upload.setSizeMax(4194304); // 设置最大文件尺寸，这里是4MB        List<FileItem> items = upload.parseRequest(request);// 得到所有的文件        Iterator<FileItem> i = items.iterator();        while (i.hasNext()) {            FileItem fi = (FileItem) i.next();            String fileName = fi.getName();            if (fileName != null) {                File fullFile = new File(fi.getName());                File savedFile = new File(uploadPath, fullFile.getName());                fi.write(savedFile);            }        }        System.out.print("upload succeed");    } catch (Exception e) {        System.out.println(e.getMessage());        // 可以跳转出错页面        e.printStackTrace();    }}

}