《Java Spring框架》Spring Http发送和接收案例

以下案例基于：Spring 3.2x 版本。

用于测试的Action（controller）。

    @RequestMapping(value = "getData.json")
    public @ResponseBody
    ServerResponse getData(HttpSession session, String flag){
        String str;
        if(!StringUtils.isBlank(flag)){
            str = "您传的是“"+flag+"”";
        }else{
            str = "您传的是空";
        }
        return new ServerResponse(str);
    }

案例（get）：

import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponents;
import org.springframework.web.util.UriComponentsBuilder;

import java.net.URI;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.Map;

public class HttpGetDemo {

    static String URL = "http://XXX.XXX.XXX.XXX:XXXX/getData.json";

    public static void main(String[] args) {
        //get请求案例。
        getRequest();
    }

    public static void getRequest(){
        RestTemplate restTemplate = HttpGetDemo.getInstance("utf-8");
        StringBuilder result = new StringBuilder();
        result.append(restTemplate.getForEntity(URL, String.class).getBody());
        System.out.println(result);
        System.out.println("--------------------------------------------------------------");
        //方式二
        result = new StringBuilder();
        result.append(restTemplate.getForEntity(URL+"?flag={1}", String.class, "方法2").getBody());
        System.out.println(result);
        System.out.println("--------------------------------------------------------------");
        //方式三
        result = new StringBuilder();
        Map<String, String> params = new HashMap<String, String>();
        params.put("flag", "方法3");
        result.append(restTemplate.getForEntity(URL+"?flag={flag}", String.class, params).getBody());
        System.out.println(result);
        System.out.println("--------------------------------------------------------------");
        //方式四
        result = new StringBuilder();
        UriComponents uriComponents = UriComponentsBuilder.fromUriString(
                URL+"?flag={flag}")
                .build()
                .expand("方法4")
                .encode();
        URI uri = uriComponents.toUri();
        result.append(restTemplate.getForEntity(uri, String.class).getBody());
        System.out.println(result);
    }

    public static RestTemplate getInstance(String charset) {
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(1,new StringHttpMessageConverter(Charset.forName(charset)));
        return restTemplate;
    }
}

运行结果：

用于测试的Action（controller）。

@RequestMapping(value = "getData.json")
public @ResponseBody
ServerResponse getData(HttpSession session,@RequestBody People people){
    return new ServerResponse(people);
}

 案例（post）：

public class ServerResponse {
    String msg;
    String code;
    Boolean success;
    People data;

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public Boolean getSuccess() {
        return success;
    }

    public void setSuccess(Boolean success) {
        this.success = success;
    }

    public People getData() {
        return data;
    }

    public void setData(People data) {
        this.data = data;
    }

    public String toString(){
        return "姓名："+data.getName()+"，年龄："+data.getAge()+"。";
    }
}

public class People {
    private String name;
    private String age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }
}

import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import java.nio.charset.Charset;

public class HttpPostDemo {
    static String URL = "http://XXX.XXX.XXX.XXX:XXXX/getData.json";

    public static void main(String[] args) {
        //post请求案例。
        postRequest();
    }

    public static void postRequest(){
        RestTemplate restTemplate = HttpGetDemo.getInstance("utf-8");
        People people = new People();
        people.setAge("18");
        people.setName("李磊");
        ResponseEntity<ServerResponse> serverResponseEntity = restTemplate.postForEntity(URL, people,ServerResponse.class);
        System.out.println(serverResponseEntity.getBody());
        System.out.println("--------------------------------------------------------------");

        //方式二
        people = new People();
        people.setAge("20");
        people.setName("韩梅梅");
        ServerResponse serverResponse = restTemplate.postForObject(URL, people, ServerResponse.class);
        System.out.println(serverResponse);
    }

    public static RestTemplate getInstance(String charset) {
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(1,new StringHttpMessageConverter(Charset.forName(charset)));
        return restTemplate;
    }
}

运行结果：