上传的后台的java代码上传文件java

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ajax上传文件后，后台java如何接收（求后台接收的完整代码）

写一个servlet或jsp来接收，在servlet或jsp处理业务逻辑，后返回处理结果或新的数据

如jsp：

%@ page errorPage="/common/error/error.jsp" %

%@ page contentType="text/html;charset=GBK"%

String planeNumber = request.getParameter("planeNumber");

String planeType = com.aerolink.aocs.system.parameter.list.PlaneTypeFactory.getPlaneType(planeNumber);

response.getWriter().write(planeType);%

相关问答

Q1: app怎么上传图片到java后台？java后台处理的具体代码是怎么写的？

使用一些已有的组件帮助我们实现这种上传功能。常用的上传组件上传的后台的java代码：Apache的CommonsFileUploadJavaZoom的UploadBeanjspSmartUpload以下，以FileUpload为例讲解1、在jsp端要注意enctype="multipart/form-data"然后只需要放置一个file控件，并执行submit操作即可2、web端核心代码如下：publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{request.setCharacterEncoding("UTF-8");DiskFileItemFactoryfactory=newDiskFileItemFactory();ServletFileUploadupload=newServletFileUpload(factory);try{Listitems=upload.parseRequest(request);Iteratoritr=items.iterator();while(itr.hasNext()){FileItemitem=(FileItem)itr.next();if(item.isFormField()){System.out.println("表单参数名:"+item.getFieldName()+"，表单参数值:"+item.getString("UTF-8"));}else{if(item.getName()!=null!item.getName().equals("")){System.out.println("上传文件的大小:"+item.getSize());System.out.println("上传文件的类型:"+item.getContentType());System.out.println("上传文件的名称:"+item.getName());FiletempFile=newFile(item.getName());Filefile=newFile(sc.getRealPath("/")+savePath,tempFile.getName());item.write(file);request.setAttribute("upload.message","上传文件成功上传的后台的java代码！");}else{request.setAttribute("upload.message","没有选择上传文件！");}}}}catch(FileUploadExceptione){e.printStackTrace();}catch(Exceptione){e.printStackTrace();request.setAttribute("upload.message","上传文件失败！");}request.getRequestDispatcher("/uploadResult.jsp").forward(request,response);}

Q2: 微信开发平台中有个接口是上传多媒体文件，我用的是java 开发的，我怎么样才能在后台实现呢？代码如下：

/**

* 文件上传到微信服务器

* @param fileType 文件类型

* @param filePath 文件路径

* @return JSONObject

* @throws Exception

public static JSONObject send(String fileType, String filePath) throws Exception {

String result = null;

File file = new File(filePath);

if (!file.exists() || !file.isFile()) {

throw new IOException("文件不存在");

}

/**

* 第一部分

URL urlObj = new URL(""+ getAccess_token() + "type="+fileType+"");

HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();

con.setRequestMethod("POST"); // 以Post方式提交表单上传的后台的java代码，默认get方式

con.setDoInput(true);

con.setDoOutput(true);

con.setUseCaches(false); // post方式不能使用缓存

// 设置请求头信息

con.setRequestProperty("Connection", "Keep-Alive");

con.setRequestProperty("Charset", "UTF-8");

// 设置边界

String BOUNDARY = "----------" + System.currentTimeMillis();

con.setRequestProperty("Content-Type", "multipart/form-data; boundary="+ BOUNDARY);

// 请求正文信息

// 第一部分上传的后台的java代码：

StringBuilder sb = new StringBuilder();

sb.append("--"); // 必须多两道线

sb.append(BOUNDARY);

sb.append("\r\n");

sb.append("Content-Disposition: form-data;name=\"file\";filename=\""+ file.getName() + "\"\r\n");

sb.append("Content-Type:application/octet-stream\r\n\r\n");

byte[] head = sb.toString().getBytes("utf-8");

// 获得输出流

OutputStream out = new DataOutputStream(con.getOutputStream());

// 输出表头

out.write(head);

// 文件正文部分

// 把文件已流文件的方式推入到url中

DataInputStream in = new DataInputStream(new FileInputStream(file));

int bytes = 0;

byte[] bufferOut = new byte[1024];

while ((bytes = in.read(bufferOut)) != -1) {

out.write(bufferOut, 0, bytes);

}

in.close();

// 结尾部分

byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线

out.write(foot);

out.flush();

out.close();

StringBuffer buffer = new StringBuffer();

BufferedReader reader = null;

try {

// 定义BufferedReader输入流来读取URL的响应

reader = new BufferedReader(new InputStreamReader(con.getInputStream()));

String line = null;

while ((line = reader.readLine()) != null) {

//System.out.println(line);

buffer.append(line);

}

if(result==null){

result = buffer.toString();

}

} catch (IOException e) {

System.out.println("发送POST请求出现异常！" + e);

e.printStackTrace();

throw new IOException("数据读取异常");

} finally {

if(reader!=null){

reader.close();

}

JSONObject jsonObj =new JSONObject(result);

return jsonObj;

}

Q3: 使用java ssh框架利用Uploadify做上传功能，后台action里该怎么写，请写出具体代码

Uploadify 是一个比较坑上传的后台的java代码的东西上传的后台的java代码，得用servlet, web.xml里配置然后servlet接收

servlet

servlet-nameupload/servlet-name

servlet-classcom.action.upload/servlet-class

/servlet

servlet-mapping

servlet-nameupload/servlet-name

url-pattern/upload/FileUploadServlet/url-pattern

/servlet-mapping

servlet里代码

public void doGetAndPost(HttpServletRequest request,

HttpServletResponse response){

try {

request.setCharacterEncoding("utf-8");

} catch (UnsupportedEncodingException e) {

logger.error("后台添加图片上传的后台的java代码，request设置编码符失败上传的后台的java代码！ {}",e.getMessage());

}

DiskFileItemFactory fac = new DiskFileItemFactory();

ServletFileUpload upload = new ServletFileUpload(fac);

upload.setHeaderEncoding("utf-8");

List fileList = null;

try {

fileList = upload.parseRequest(request);

} catch (FileUploadException ex) {

ex.printStackTrace();

return;

}

String imageName = null;

IteratorFileItem it = fileList.iterator();

while (it.hasNext()) {

FileItem item = it.next();

if (!item.isFormField()) {

Random r = new Random();

int rannum = (int) (r.nextDouble() * (9999 - 1000 + 1)) + 1000;

imageName=getNowStrDate() + rannum;

FileBean fileBean = new FileBean();

fileBean.setFileName(item.getName());

fileBean.setFileExtension(item.getName().substring(item.getName().indexOf(".")+1));

FileBean flbn;

try {

//文件服务器处理上传图片

flbn = FastDFSUtil.upload(fileBean, item.getInputStream());

} catch (IOException e) {

logger.info("添加图片上传的后台的java代码，上传文件服务器失败！",e);

}

Q4: java后台文件上传到资源服务器上

package com.letv.dir.cloud.util;import com.letv.dir.cloud.controller.DirectorWatermarkController;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.*;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;/** * Created by xijunge on 2016/11/24 0024. */public class HttpRequesterFile { private static final Logger log = LoggerFactory.getLogger(HttpRequesterFile.class); private static final String TAG = "uploadFile"; private static final int TIME_OUT = 100 * 1000; // 超时时间 private static final String CHARSET = "utf-8"; // 设置编码 /** * 上传文件到服务器 * * @param file * 需要上传的文件 * @param RequestURL * 文件服务器的rul * @return 返回响应的内容 * */ public static String uploadFile(File file, String RequestURL) throws IOException {

String result = null;

String BOUNDARY = "letv"; // 边界标识随机生成 String PREFIX = "--", LINE_END = "\r\n";

String CONTENT_TYPE = "multipart/form-data"; // 内容类型 try {

URL url = new URL(RequestURL);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setReadTimeout(TIME_OUT);

conn.setConnectTimeout(TIME_OUT);

conn.setDoInput(true); // 允许输入流 conn.setDoOutput(true); // 允许输出流 conn.setUseCaches(false); // 不允许使用缓存 conn.setRequestMethod("POST"); // 请求方式 conn.setRequestProperty("Charset", CHARSET); // 设置编码 conn.setRequestProperty("connection", "keep-alive");

conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);

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