Java模拟Post和get请求并处理返回字符串
0x01 准备
tomcat(搭建服务器Servlet用于测试返回)
maven(可有可无，有就添加依赖，无则导入相关包（httpclient的相关包）)
所需包（httpclient和相关依赖，fastjson（处理json数据））
jar包下载
无maven
考虑到有人可能就用其中的一些包，就分开给出下载地址
(httpclient+fastjson)
链接: https://pan.baidu.com/s/1xepP_Ys0aMJDxlVJxhUBHQ 提取码: 8djf（fastjson）
链接: https://pan.baidu.com/s/1ZTkMtpem3HeF8q1KPvRIiA 提取码: rekk（httpclient）
链接: https://pan.baidu.com/s/16BIQx8inPYc_miKDbZrfyQ 提取码: diw4
有maven
添加相关依赖
（httpclient）
org.apache.httpcomponents
httpclient
4.5.3
(fastjson)
com.alibaba
fastjson
1.2.58
0x02
环境准备
编写服务器端（tomcat）
在maven上引入fastjson
编写person(Javabean)
package bean;
import java.util.Map;
public class Person {
private String name;
private char sex;
private int age;
private String mail;
private String phone;
private Map data;
public Map getData() {
return data;
}
public void setData(Map data) {
this.data = data;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public char getSex() {
return sex;
}
public void setSex(char sex) {
this.sex = sex;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getMail() {
return mail;
}
public void setMail(String mail) {
this.mail = mail;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getMethod() {
return method;
}
public void setMethod(String method) {
this.method = method;
}
private String method;
}
编写PandGs类(servlet返回json文本)
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter out = response.getWriter();
String pString=request.getParameter("pw");
if(pString==null){
Person person=new Person();
person.setAge(10);
person.setMail("[email protected]");
person.setName("Little Ming");
person.setPhone("88888888");
person.setSex('M');
person.setMethod("GET");
String text=JSON.toJSONString(person);
out.println(text);
out.flush();
out.close();
}else {
Person person=new Person();
person.setAge(10);
person.setMail("[email protected]");
person.setName("Little Ming");
person.setPhone("88888888");
person.setSex('M');
person.setMethod("GET");
person.setData(request.getParameterMap());
String text=JSON.toJSONString(person);
out.println(text);
out.flush();
out.close();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
String pString=request.getParameter("pw");
if(pString==null){
Person person=new Person();
person.setAge(10);
person.setMail("[email protected]");
person.setName("Little Fang");
person.setPhone("77777777");
person.setSex('F');
person.setMethod("Post");
String text=JSON.toJSONString(person);
out.println(text);
out.flush();
out.close();
}else {
Person person=new Person();
person.setAge(10);
person.setAge(10);
person.setMail("[email protected]");
person.setName("Little Fang");
person.setPhone("77777777");
person.setSex('F');
person.setMethod("Post");
person.setData(request.getParameterMap());
String text=JSON.toJSONString(person);
out.println(text);
out.flush();
out.close();
}
}0x03编写模拟类
导入包（无maven导入）
测试类
Get方法不提交数据
public static void main(String[]args) {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
//创建Get链接并且得到返回的字符串
HttpGet httpGet = new HttpGet("http://localhost:8080/PandG/PandGs");
CloseableHttpResponse response = httpclient.execute(httpGet);
HttpEntity entity = response.getEntity();
String string=EntityUtils.toString(entity);
System.out.println(string);
//{"age":10,"mail":"[email protected]","method":"GET","name":"Little Ming","phone":"88888888","sex":"M"}
//fastjson解析string成为object
JSONObject jObject=JSON.parseObject(string);
//获取类里面的成员并且输出
System.out.println("姓名是:"+jObject.getString("name"));
System.out.println("年龄"+jObject.getString("age"));
System.out.println("请求方法"+jObject.getString("method"));
/*
* 姓名是:Little Ming
* 年龄10
* 请求方法GET
*/
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}Get方法提交数据
方法1（直接在url后加）
public static void main(String[]args) {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
//创建Get链接并且得到返回的字符串
HttpGet httpGet = new HttpGet("http://localhost:8080/PandG/PandGs?pw=123");
CloseableHttpResponse response = httpclient.execute(httpGet);
HttpEntity entity = response.getEntity();
String string=EntityUtils.toString(entity);
System.out.println(string);
//{"age":10,"data":{"pw":["123"]},"mail":"[email protected]","method":"GET","name":"Little Ming","phone":"88888888","sex":"M"}
//fastjson解析string成为object
JSONObject jObject=JSON.parseObject(string);
//获取类里面的成员并且输出
System.out.println("姓名是:"+jObject.getString("name"));
System.out.println("年龄"+jObject.getString("age"));
System.out.println("请求方法"+jObject.getString("method"));
System.out.println("提交的数据是"+jObject.getJSONObject("data").getJSONArray("pw").toString());
/*
* 姓名是:Little Ming
*年龄10
*请求方法GET
*提交的数据是["123"]
*/
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}方法2
public static void main(String[]args) {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
//创建Get链接并且得到返回的字符串
URI uri=new URIBuilder("http://localhost:8080/PandG/PandGs").setParameter("pw", "12345").build();
HttpGet httpGet=new HttpGet(uri);
CloseableHttpResponse response = httpclient.execute(httpGet);
HttpEntity entity = response.getEntity();
String string=EntityUtils.toString(entity);
System.out.println(string);
//{"age":10,"data":{"pw":["12345"]},"mail":"[email protected]","method":"GET","name":"Little Ming","phone":"88888888","sex":"M"}
//fastjson解析string成为object
JSONObject jObject=JSON.parseObject(string);
//获取类里面的成员并且输出
System.out.println("姓名是:"+jObject.getString("name"));
System.out.println("年龄"+jObject.getString("age"));
System.out.println("请求方法"+jObject.getString("method"));
System.out.println("提交的数据是"+jObject.getJSONObject("data").getJSONArray("pw").toString());
/*
* 姓名是:Little Ming
*年龄10
*请求方法GET
*提交的数据是["12345"]
*/
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}Post提交数据（键值对）
方法1
只需把HttpGet改成HttpPost
public static void main(String[]args) {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
//创建Get链接并且得到返回的字符串
URI uri=new URIBuilder("http://localhost:8080/PandG/PandGs").setParameter("pw", "12345").build();
HttpPost httpPost=new HttpPost(uri);
CloseableHttpResponse response = httpclient.execute(httpPost);
HttpEntity entity = response.getEntity();
String string=EntityUtils.toString(entity);
System.out.println(string);
//{"age":10,"data":{"pw":["12345"]},"mail":"[email protected]","method":"Post","name":"Little Fang","phone":"77777777","sex":"F"}
//fastjson解析string成为object
JSONObject jObject=JSON.parseObject(string);
//获取类里面的成员并且输出
System.out.println("姓名是:"+jObject.getString("name"));
System.out.println("年龄"+jObject.getString("age"));
System.out.println("请求方法"+jObject.getString("method"));
System.out.println("提交的数据是"+jObject.getJSONObject("data").getJSONArray("pw").toString());
/*
* 姓名是:Little Fang
*年龄10
*请求方法Post
*提交的数据是["12345"]
*/
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}方法2
public static void main(String[]args) {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
//创建Get链接并且得到返回的字符串
HttpPost httpPost = new HttpPost("http://localhost:8080/PandG/PandGs");
List nvps = new ArrayList ();
nvps.add(new BasicNameValuePair("name", "Little Fang"));
nvps.add(new BasicNameValuePair("pw", "123123"));
httpPost.setEntity(new UrlEncodedFormEntity(nvps));
CloseableHttpResponse response = httpclient.execute(httpPost);
HttpEntity entity = response.getEntity();
String string=EntityUtils.toString(entity);
System.out.println(string);
//{"age":10,"data":{"name":["Little Fang"],"pw":["123123"]},"mail":"[email protected]","method":"Post","name":"Little Fang","phone":"77777777","sex":"F"}
//fastjson解析string成为object
JSONObject jObject=JSON.parseObject(string);
//获取类里面的成员并且输出
System.out.println("姓名是:"+jObject.getString("name"));
System.out.println("年龄"+jObject.getString("age"));
System.out.println("请求方法"+jObject.getString("method"));
System.out.println("提交的数据是"+jObject.getJSONObject("data").getJSONArray("pw").toString());
/*
* 姓名是:Little Fang
*年龄10
*请求方法Post
*提交的数据是["123123"]
*/
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
} Httpclient默认的User-Agent是Apache-HttpClient/4.5.3 (Java/1.8.0_241)
我们是可以修改的
用HttpPost或者HttpGet类里面的setHeader()方法就可以解决