HttpClient上传、接收图片

骑猪看日落 2022-07-12 15:27 223阅读 0赞

转载于：[http://jingtaohailang.blog.51cto.com/8862159/1544821][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][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();
        }
    }

[http_jingtaohailang.blog.51cto.com_8862159_1544821]: http://jingtaohailang.blog.51cto.com/8862159/1544821
[http_localhost_7081_sendmessa_testServlet]: http://localhost:7081/sendmessa/testServlet