向网络发送GET/POST请求参数

使用GET方法发送请求

[java] view plain copy print?private static boolean sendGETRequest (String path,

Map<String, String> params) throws Exception{

//发送地http://192.168.100.91:8080/videoService/login?username=abc&password=123

// StringBuilder是用来组拼请求地址和参数

StringBuilder sb = new StringBuilder();

sb.append(path).append(”?”);

if(params!=null &¶ms.size()!=0){

for (Map.Entry<String, String> entry : params.entrySet()) {

//如果请求参数中有中文，需要进行URLEncoder编码

sb.append(entry.getKey()).append(”=”).append(URLEncoder.encode(entry.getValue(), “utf-8”));

sb.append(”&”);

}

sb.deleteCharAt(sb.length()-1);

}

URL url = new URL(sb.toString());

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

conn.setConnectTimeout(5000);

conn.setRequestMethod(”GET”);

if(conn.getResponseCode()==200){

return true;

}

return false;

}

private static boolean sendGETRequest (String path,

Map<String, String> params) throws Exception{

//发送地http://192.168.100.91:8080/videoService/login?username=abc&password=123

// StringBuilder是用来组拼请求地址和参数

StringBuilder sb = new StringBuilder();

sb.append(path).append("?");

if(params!=null &¶ms.size()!=0){

for (Map.Entry<String, String> entry : params.entrySet()) {

//如果请求参数中有中文，需要进行URLEncoder编码

sb.append(entry.getKey()).append("=").append(URLEncoder.encode(entry.getValue(), "utf-8"));

sb.append("&");

}

sb.deleteCharAt(sb.length()-1);

}

URL url = new URL(sb.toString());

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

conn.setConnectTimeout(5000);

conn.setRequestMethod("GET");

if(conn.getResponseCode()==200){

return true;

}

return false;

}

使用POST方法发送请求

我们先从IE浏览器中使用POST方法发送一次：（下面内容可以用HttpWatch看到）

POST /videoService/login HTTP/1.1

Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/QVOD,
application/QVOD, */*

Referer: http://192.168.100.91:8080/videoService/login.jsp
Accept-Language: zh-CN,en;q=0.5

User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB6.5; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0)

Content-Type: application/x-www-form-urlencoded//POST请求这个一定要设置

Accept-Encoding: gzip, deflate

Host: 192.168.100.91:8080

Content-Length: 26//还有发送内容长度也要设置

Connection: Keep-Alive

Cache-Control: no-cache

Cookie: JSESSIONID=7E1435CB8A071D07A430453250348C41

username=asd&password=1234//这里是请求体部分，一共26个字节，与Content-Length长度一样

[java] view plain copy print?private static boolean sendPOSTRequest(String path,

Map<String, String> params) throws Exception{

// StringBuilder是用来组拼请求参数

StringBuilder sb = new StringBuilder();

if(params!=null &¶ms.size()!=0){

for (Map.Entry<String, String> entry : params.entrySet()) {

sb.append(entry.getKey()).append(”=”).append(URLEncoder.encode(entry.getValue(), “utf-8”));

sb.append(”&”);

}

sb.deleteCharAt(sb.length()-1);

}

// entity为请求体部分内容

//如果有中文则以UTF-8编码为username=%E4%B8%AD%E5%9B%BD&password=123

byte[] entity = sb.toString().getBytes();

URL url = new URL(path);

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

conn.setConnectTimeout(5000);

conn.setRequestMethod(”POST”);

//要向外输出数据，要设置这个

conn.setDoOutput(true);

conn.setRequestProperty(”Content-Type”, “application/x-www-form-urlencoded”);

conn.setRequestProperty(”Content-Length”, entity.length+“”);

OutputStream os = conn.getOutputStream();

//以POST方式发送请求体

os.write(entity);

if(conn.getResponseCode()==200){

return true;

}

return false;

}

private static boolean sendPOSTRequest(String path,

Map<String, String> params) throws Exception{

// StringBuilder是用来组拼请求参数

StringBuilder sb = new StringBuilder();

if(params!=null &¶ms.size()!=0){

for (Map.Entry<String, String> entry : params.entrySet()) {

sb.append(entry.getKey()).append("=").append(URLEncoder.encode(entry.getValue(), "utf-8"));

sb.append("&");

}

sb.deleteCharAt(sb.length()-1);

}

// entity为请求体部分内容

//如果有中文则以UTF-8编码为username=%E4%B8%AD%E5%9B%BD&password=123

byte[] entity = sb.toString().getBytes();

URL url = new URL(path);

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

conn.setConnectTimeout(5000);

conn.setRequestMethod("POST");

//要向外输出数据，要设置这个

conn.setDoOutput(true);

conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

conn.setRequestProperty("Content-Length", entity.length+"");

OutputStream os = conn.getOutputStream();

//以POST方式发送请求体

os.write(entity);

if(conn.getResponseCode()==200){

return true;

}

return false;

}

以Android集成的HttpClient框架来发送

[java] view plain copy print?private static boolean sendPOSTRequestHttpClient(String path,
Map<String, String> params) throws Exception{
//封装请求参数
List<NameValuePair> pair = new ArrayList<NameValuePair>();
if(params!=null&& !params.isEmpty()){
for(Map.Entry<String, String> entry:params.entrySet()){
pair.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
}
//把请求参数变成请求体部分
UrlEncodedFormEntity uee = new UrlEncodedFormEntity(pair, “utf-8”);
//使用HttpPost对象设置发送的URL路径
HttpPost post = new HttpPost(path);
//发送请求体
post.setEntity(uee);
//创建一个浏览器对象，以把POST对象向服务器发送，并返回响应消息
DefaultHttpClient dhc = new DefaultHttpClient();
HttpResponse response = dhc.execute(post);
if(response.getStatusLine().getStatusCode()==200){
Log.i(”http”, “httpclient”);
return true;
}
return false;
}

private static boolean sendPOSTRequestHttpClient(String path,
Map<String, String> params) throws Exception{
//封装请求参数
List<NameValuePair> pair = new ArrayList<NameValuePair>();
if(params!=null&& !params.isEmpty()){
for(Map.Entry<String, String> entry:params.entrySet()){
pair.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
}
//把请求参数变成请求体部分
UrlEncodedFormEntity uee = new UrlEncodedFormEntity(pair, "utf-8");
//使用HttpPost对象设置发送的URL路径
HttpPost post = new HttpPost(path);
//发送请求体
post.setEntity(uee);
//创建一个浏览器对象，以把POST对象向服务器发送，并返回响应消息
DefaultHttpClient dhc = new DefaultHttpClient();
HttpResponse response = dhc.execute(post);
if(response.getStatusLine().getStatusCode()==200){
Log.i("http", "httpclient");
return true;
}
return false;
}

转自：http://www.zuidaima.com/share/1550463555308544.htm

在servlet中GET请求可以通过HttpServletRequest的getRequestURL方法和getQueryString()得到完整的请求路径和请求所有参数列表，POST的需要getParameterMap()方法遍历得到，不论GET或POST都可以通过getRequestURL+getParameterMap()来得到请求完整路径

[java] view plain copy print?



package com.zuidaima
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class GetParams extends HttpServlet {
private static final long serialVersionUID = 1L;

public GetParams() {
super();
}

protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter writer = response.getWriter();
writer.println(”GET ” + request.getRequestURL() + “ ”
+ request.getQueryString());

Map<String, String[]> params = request.getParameterMap();
String queryString = ”“;
for (String key : params.keySet()) {
String[] values = params.get(key);
for (int i = 0; i < values.length; i++) {
String value = values[i];
queryString += key + ”=” + value + “&”;
}
}
// 去掉最后一个空格
queryString = queryString.substring(0, queryString.length() - 1);
writer.println(”GET ” + request.getRequestURL() + “ ” + queryString);
}

protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter writer = response.getWriter();
Map<String, String[]> params = request.getParameterMap();
String queryString = ”“;
for (String key : params.keySet()) {
String[] values = params.get(key);
for (int i = 0; i < values.length; i++) {
String value = values[i];
queryString += key + ”=” + value + “&”;
}
}
// 去掉最后一个空格
queryString = queryString.substring(0, queryString.length() - 1);
writer.println(”POST ” + request.getRequestURL() + “ ” + queryString);
}
}

package com.zuidaima
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class GetParams extends HttpServlet {
private static final long serialVersionUID = 1L;

public GetParams() {
super();
}

protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter writer = response.getWriter();
writer.println("GET " + request.getRequestURL() + " "
+ request.getQueryString());

Map<String, String[]> params = request.getParameterMap();
String queryString = "";
for (String key : params.keySet()) {
String[] values = params.get(key);
for (int i = 0; i < values.length; i++) {
String value = values[i];
queryString += key + "=" + value + "&";
}
}
// 去掉最后一个空格
queryString = queryString.substring(0, queryString.length() - 1);
writer.println("GET " + request.getRequestURL() + " " + queryString);
}

protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter writer = response.getWriter();
Map<String, String[]> params = request.getParameterMap();
String queryString = "";
for (String key : params.keySet()) {
String[] values = params.get(key);
for (int i = 0; i < values.length; i++) {
String value = values[i];
queryString += key + "=" + value + "&";
}
}
// 去掉最后一个空格
queryString = queryString.substring(0, queryString.length() - 1);
writer.println("POST " + request.getRequestURL() + " " + queryString);
}
}