HttpClient4模拟带文件上传的表单提交
这里用apache的HttpClient4.3模拟文件上传，上传到一个java servlet，然后用servlet解析，把上传文件放到服务器目录下
下面这个java应用，往一个java servlet中提交了一个文件，和几个普通表单属性
package com.test.httpClient;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class ClientMultipartFormPost {
/**
* 这个例子展示了如何执行请求包含一个多部分编码的实体
* 模拟表单提交
* @throws IOException
*/
public static void main(String[] args) throws IOException {
CloseableHttpClient httpClient = HttpClients.createDefault();
try{
//要上传的文件的路径
String filePath = "D:\\my_shutdown.log";
//把一个普通参数和文件上传给下面这个地址 是一个servlet
HttpPost httpPost = new HttpPost("http://localhost:80/testjs/servlet/UploadServlet");
//把文件转换成流对象FileBody
FileBody bin = new FileBody(new File(filePath));
//普通字段 重新设置了编码方式
StringBody comment = new StringBody("这里是一个评论", ContentType.create("text/plain", Consts.UTF_8));
//StringBody comment = new StringBody("这里是一个评论", ContentType.TEXT_PLAIN);
StringBody name = new StringBody("王五", ContentType.create("text/plain", Consts.UTF_8));
StringBody password = new StringBody("123456", ContentType.create("text/plain", Consts.UTF_8));
HttpEntity reqEntity = MultipartEntityBuilder.create()
.addPart("media", bin)//相当于<input type="file" name="media"/>
.addPart("comment", comment)
.addPart("name", name)//相当于<input type="text" name="name" value=name>
.addPart("password", password)
.build();
httpPost.setEntity(reqEntity);
System.out.println("发起请求的页面地址 " + httpPost.getRequestLine());
//发起请求 并返回请求的响应
CloseableHttpResponse response = httpClient.execute(httpPost);
try {
System.out.println("----------------------------------------");
//打印响应状态
System.out.println(response.getStatusLine());
//获取响应对象
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
//打印响应长度
System.out.println("Response content length: " + resEntity.getContentLength());
//打印响应内容
System.out.println(EntityUtils.toString(resEntity,Charset.forName("UTF-8")));
}
//销毁
EntityUtils.consume(resEntity);
} finally {
response.close();
}
}finally{
httpClient.close();
}
}
}
用于接收的java servlet 用到了apache的common-fileupload来解析请求main中提交的参数
package com.vincente.test.servlet; import java.io.BufferedReader; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.HttpURLConnection; import java.net.URL; 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.FileItemFactory; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class UploadServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); //利用apache的common-upload上传组件来进行 来解析获取到的流文件 //把上传来的文件放在这里 String uploadPath = getServletContext().getRealPath("/upload");//获取文件路径 //检测是不是存在上传文件 // Check that we have a file upload request boolean isMultipart = ServletFileUpload.isMultipartContent(request); if(isMultipart){ DiskFileItemFactory factory = new DiskFileItemFactory(); //指定在内存中缓存数据大小,单位为byte,这里设为1Mb factory.setSizeThreshold(1024*1024); //设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录 factory.setRepository(new File("D://temp")); // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(factory); // 指定单个上传文件的最大尺寸,单位:字节，这里设为5Mb upload.setFileSizeMax(5 * 1024 * 1024); //指定一次上传多个文件的总尺寸,单位:字节，这里设为10Mb upload.setSizeMax(10 * 1024 * 1024); upload.setHeaderEncoding("UTF-8"); //设置编码，因为我的jsp页面的编码是utf-8的 List<FileItem> items = null; try { // 解析request请求 items = upload.parseRequest(request); } catch (FileUploadException e) { e.printStackTrace(); } if(items!=null){ //把上传文件放到服务器的这个目录下 if (!new File(uploadPath).isDirectory()){ new File(uploadPath).mkdirs(); //选定上传的目录此处为当前目录，没有则创建 } //解析表单项目 // Process the uploaded items Iterator<FileItem> iter = items.iterator(); while (iter.hasNext()) { FileItem item = iter.next(); //如果是普通表单属性 if (item.isFormField()) { //<input type="text" name="content"> String name = item.getFieldName();//相当于input的name属性 String value = item.getString();//input的value属性 System.out.println("属性:"+name+" 属性值:"+value); } //如果是上传文件 else { //属性名 String fieldName = item.getFieldName(); //上传文件路径 String fileName = item.getName(); fileName = fileName.substring(fileName.lastIndexOf("/")+1);// 获得上传文件的文件名 try { item.write(new File(uploadPath,fileName)); } catch (Exception e) { e.printStackTrace(); } //给请求页面返回响应 response.getWriter().println("文件上传成功! 文件名是:"+fileName); } } } } }main中的执行结果： 发起请求的页面地址 POST http://localhost:80/testjs/servlet/UploadServlet HTTP/1.1 ---------------------------------------- HTTP/1.1 200 OK Response content length: 50 文件上传成功! 文件名是:my_shutdown.log tomcat中的执行结果： 属性:comment 属性值:这里是一个评论 属性:name 属性值:王五 属性:password 属性值:123456