In the previous article, we have implemented an HTTP GET and POST request;
Here I encapsulate an auxiliary class of HTTP get and post, which can be used better;
Class name: HttpRequestUtil
The following functions are provided:
(1) simulate GET request;
(2) simulate POST request;
(3) upload request of simulation file;
(4) sending XML data;
Send GET request
Parameters:
(1)url: a simple URL without any parameters;
(2)params: parameter;
(3)headers: HTTP request headers to be set;
Return:
HttpURLConnection
Send POST request
(2)public static URLConnection sendPostRequest(String url, Map<String, String> params, Map<String, String> headers)
Parameters:
(1)url: a simple URL without any parameters;
(2)params: parameter;
(3)headers: HTTP request headers to be set;
Return:
HttpURLConnection
File upload
(3)public static boolean uploadFiles(String url, Map<String, String> params, FormFile[] files)
Parameters:
(1)url: simple URL
(2)params: parameter;
(3)files: multiple files
Return: upload succeeded
(4)public static boolean uploadFile(String path, Map<String, String> params, FormFile file)
Parameters:
(1)url: simple URL
(2)params: parameter;
(3)file: a file
Return: upload succeeded
Send XML data
(5)public static byte[] postXml(String url, String xml, String encoding)
Parameters:
(1)url: simple URL
(2)xml: XML data
(3)XML data encoding
For upload files, the constructor declaration of FormFile is as follows:
(1)public FormFile(String filname, byte[] data, String parameterName, String contentType)
Parameters:
(1)filname: the name of the file
(2)data: file data
(3)parameterName: the name of the parameter of the HTML file upload control
(4)contentType: file type, for example, text/plain is txt
(2)public FormFile(String filname, File file, String parameterName, String contentType)
Parameters:
(1)filname: the name of the file
(2)file: file name
(3)parameterName: the name of the parameter of the HTML file upload control
(4)contentType: file type, for example, text/plain is txt
FormFile.java
package com.xiazdong.netword.http.util;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStream;/** * Upload file*/public class FormFile { /* Upload file data */ private byte[] data; private InputStream inStream; private File file; /* File name */ private String filname; /* Request parameter name*/ private String parameterName; /* Content type */ private String contentType = "application/octet-stream"; /** * This function is used to transfer small files* @param filname * @param data * @param parameterName * @param contentType */ public FormFile(String filname, byte[] data, String parameterName, String contentType) { this.data = data; this.filname = filname; this.parameterName = parameterName; if(contentType!=null) this.contentType = contentType; } /** * This function is used to transfer large files* @param filname * @param file * @param parameterName * @param contentType */ public FormFile(String filname, File file, String parameterName, String contentType) { this.filname = filname; this.parameterName = parameterName; this.file = file; try { this.inStream = new FileInputStream(file); } catch (FileNotFoundException e) { e.printStackTrace(); } if(contentType!=null) this.contentType = contentType; } public File getFile() { return file; } public InputStream getInStream() { return inStream; } public byte[] getData() { return data; } public String getFilname() { return filname; } public void setFilname(String filname) { this.filname = filname; } public String getParameterName() { return parameterName; } public void setParameterName(String parameterName) { this.parameterName = parameterName; } public String getContentType() { return contentType; } public void setContentType(String contentType) { this.contentType = contentType; } }HttpRequestUtil.java
package com.xiazdong.netword.http.util;import java.io.BufferedReader;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.InetAddress;import java.net.Socket;import java.net.URL;import java.net.URLConnection;import java.net.URLEncoder;import java.util.HashMap;import java.util.Map;import java.util.Map.Entry;import java.util.Set;/* * This class is used to send HTTP requests* */public class HttpRequestUtil { /** * Send GET request* @param url * @param params * @param headers * @return * @throws Exception */ public static URLConnection sendGetRequest(String url, Map<String, String> params, Map<String, String> headers) throws Exception { StringBuilder buf = new StringBuilder(url); Set<Entry<String, String>> entrys = null; // If it is a GET request, the request parameter is in the URL if (params != null && !params.isEmpty()) { buf.append("?"); entrys = params.entrySet(); for (Map.Entry<String, String> entry : entrys) { buf.append(entry.getKey()).append("=") .append(URLEncoder.encode(entry.getValue(), "UTF-8")) .append("&"); } buf.deleteCharAt(buf.length() - 1); } URL url1 = new URL(buf.toString()); HttpURLConnection conn = (HttpURLConnection) url1.openConnection(); conn.setRequestMethod("GET"); // Set request header if (headers != null && !headers.isEmpty()) { entrys = headers.entrySet(); for (Map.Entry<String, String> entry : entrys) { conn.setRequestProperty(entry.getKey(), entry.getValue()); } } conn.getResponseCode(); return conn; } /** * Send POST request* @param url * @param params * @param headers * @return * @throws Exception */ public static URLConnection sendPostRequest(String url, Map<String, String> params, Map<String, String> headers) throws Exception { StringBuilder buf = new StringBuilder(); Set<Entry<String, String>> entrys = null; // If there are parameters, they are placed in the HTTP request body, such as name = AAA & age = 10 if (params != null && !params.isEmpty()) { entrys = params.entrySet(); for (Map.Entry<String, String> entry : entrys) { buf.append(entry.getKey()).append("=") .append(URLEncoder.encode(entry.getValue(), "UTF-8")) .append("&"); } buf.deleteCharAt(buf.length() - 1); } URL url1 = new URL(url); HttpURLConnection conn = (HttpURLConnection) url1.openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); OutputStream out = conn.getOutputStream(); out.write(buf.toString().getBytes("UTF-8")); if (headers != null && !headers.isEmpty()) { entrys = headers.entrySet(); for (Map.Entry<String, String> entry : entrys) { conn.setRequestProperty(entry.getKey(), entry.getValue()); } } conn.getResponseCode(); // In order to send successfully return conn; } /** * Submit data to the server directly through HTTP protocol, and realize the following form submission function: * < form method = post action = "http://192.168.0.200:8080 / SSI / fileload / test. Do" enctype = "multipart / form data" > < input type = "text" name = "name" > < input type = "text" name = "Id" > < input type = "file" name = "imagefile" / > < input type = "file" name = "zip" /> </FORM> * @param path Upload path (Note: avoid path test such as localhost or 127.0.0.1, because it will point to mobile phone simulator, you can use path test such as http://www.itcast.cn or http://192.168.1.10:8080)* @param params The request parameter key is the parameter name and the value is the parameter value* @param file Upload file */ public static boolean uploadFiles(String path, Map<String, String> params, FormFile[] files) throws Exception{ final String BOUNDARY = "---------------------------7da2137580612"; //Data separator final String endline = "--" + BOUNDARY + "--\r\n";//Data end flag int fileDataLength = 0; if(files!=null&&files.length!=0){ for(FormFile uploadFile : files){//Get the total length of file type data StringBuilder fileExplain = new StringBuilder(); fileExplain.append("--"); fileExplain.append(BOUNDARY); fileExplain.append("\r\n"); fileExplain.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n"); fileExplain.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n"); fileExplain.append("\r\n"); fileDataLength += fileExplain.length(); if(uploadFile.getInStream()!=null){ fileDataLength += uploadFile.getFile().length(); }else{ fileDataLength += uploadFile.getData().length; } } } StringBuilder textEntity = new StringBuilder(); if(params!=null&&!params.isEmpty()){ for (Map.Entry<String, String> entry : params.entrySet()) {//Construct entity data for text type parameters textEntity.append("--"); textEntity.append(BOUNDARY); textEntity.append("\r\n"); textEntity.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n"); textEntity.append(entry.getValue()); textEntity.append("\r\n"); } } //Calculate the total length of entity data transferred to the server int dataLength = textEntity.toString().getBytes().length + fileDataLength + endline.getBytes().length; URL url = new URL(path); int port = url.getPort()==-1 ? 80 : url.getPort(); Socket socket = new Socket(InetAddress.getByName(url.getHost()), port); OutputStream outStream = socket.getOutputStream(); //The following completes the sending of HTTP request header String requestmethod = "POST "+ url.getPath()+" HTTP/1.1\r\n"; outStream.write(requestmethod.getBytes()); String accept = "Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n"; outStream.write(accept.getBytes()); String language = "Accept-Language: zh-CN\r\n"; outStream.write(language.getBytes()); String contenttype = "Content-Type: multipart/form-data; boundary="+ BOUNDARY+ "\r\n"; outStream.write(contenttype.getBytes()); String contentlength = "Content-Length: "+ dataLength + "\r\n"; outStream.write(contentlength.getBytes()); String alive = "Connection: Keep-Alive\r\n"; outStream.write(alive.getBytes()); String host = "Host: "+ url.getHost() +":"+ port +"\r\n"; outStream.write(host.getBytes()); //After writing the HTTP request header, write another carriage return according to the HTTP protocol outStream.write("\r\n".getBytes()); //Send entity data of all text types outStream.write(textEntity.toString().getBytes()); //Send entity data of all file types if(files!=null&&files.length!=0){ for(FormFile uploadFile : files){ StringBuilder fileEntity = new StringBuilder(); fileEntity.append("--"); fileEntity.append(BOUNDARY); fileEntity.append("\r\n"); fileEntity.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n"); fileEntity.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n"); outStream.write(fileEntity.toString().getBytes()); if(uploadFile.getInStream()!=null){ byte[] buffer = new byte[1024]; int len = 0; while((len = uploadFile.getInStream().read(buffer, 0, 1024))!=-1){ outStream.write(buffer, 0, len); } uploadFile.getInStream().close(); }else{ outStream.write(uploadFile.getData(), 0, uploadFile.getData().length); } outStream.write("\r\n".getBytes()); } } //Send the data end flag below to indicate that the data has ended outStream.write(endline.getBytes()); BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); if(reader.readLine().indexOf("200")==-1){//Read the data returned by the web server and judge whether the request code is 200. If it is not 200, it means the request fails return false; } outStream.flush(); outStream.close(); reader.close(); socket.close(); return true; } /** * Submit data to server* @param path Upload path (Note: avoid path test such as localhost or 127.0.0.1, because it will point to mobile phone simulator, you can use path test such as http://www.itcast.cn or http://192.168.1.10:8080)* @param params The request parameter key is the parameter name and the value is the parameter value* @param file Upload file */ public static boolean uploadFile(String path, Map<String, String> params, FormFile file) throws Exception{ return uploadFiles(path, params, new FormFile[]{file}); } /** * Flow input to byte array* @param inStream * @return * @throws Exception */ public static byte[] read2Byte(InputStream inStream)throws Exception{ ByteArrayOutputStream outSteam = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while( (len = inStream.read(buffer)) !=-1 ){ outSteam.write(buffer, 0, len); } outSteam.close(); inStream.close(); return outSteam.toByteArray(); } /** * Flow input to string* @param inStream * @return * @throws Exception */ public static String read2String(InputStream inStream)throws Exception{ ByteArrayOutputStream outSteam = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while( (len = inStream.read(buffer)) !=-1 ){ outSteam.write(buffer, 0, len); } outSteam.close(); inStream.close(); return new String(outSteam.toByteArray(),"UTF-8"); } /** * Send xml data* @param path Request address* @param xml xml Data * @param encoding Encoding * @return * @throws Exception */ public static byte[] postXml(String path, String xml, String encoding) throws Exception{ byte[] data = xml.getBytes(encoding); URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.setRequestProperty("Content-Type", "text/xml; charset="+ encoding); conn.setRequestProperty("Content-Length", String.valueOf(data.length)); conn.setConnectTimeout(5 * 1000); OutputStream outStream = conn.getOutputStream(); outStream.write(data); outStream.flush(); outStream.close(); if(conn.getResponseCode()==200){ return read2Byte(conn.getInputStream()); } return null; } //Test function public static void main(String args[]) throws Exception { Map<String, String> params = new HashMap<String, String>(); params.put("name", "xiazdong"); params.put("age", "10"); HttpURLConnection conn = (HttpURLConnection) HttpRequestUtil .sendGetRequest( "http://192.168.0.103:8080/Server/PrintServlet", params, null); int code = conn.getResponseCode(); InputStream in = conn.getInputStream(); byte[]data = read2Byte(in); }}Test code:
Map<String,String> params = new HashMap<String,String>();params.put("name", name.getText().toString());params.put("age", age.getText().toString());HttpURLConnection conn = (HttpURLConnection) HttpRequestUtil.sendGetRequest("http://192.168.0.103:8080/Server/PrintServlet", params, null);File upload test code:
FormFile formFile = new FormFile(file.getName(), file, "document", "text/plain");boolean isSuccess = HttpRequestUtil.uploadFile("http://192.168.0.103:8080/Server/FileServlet", null, formFile);It's a lot easier, isn't it?