HttpClient与Spring Boot之间的json数据交互

Spring Boot PV:

使用HttpClient传递key/value数据

HttpClient网络请求代码

HttpClient发送key/value数据,返回json格式数据

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@Test
public void test() {
         
    //网络请求地址
    String url = "http://localhost:8080/api/user";
    //请求方式为post请求
    HttpPost httppost = new HttpPost(url);
    //创建网络请求对象
    HttpClient httpClient = new DefaultHttpClient();
    //请求体是Key/value数据格式,将key/value数据保存在NameValuePair中
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("name", "changyuan"));
    params.add(new BasicNameValuePair("age", "18"));
    try {
      //使用UrlEncodedFormEntity设置请求体的编码格式为UTF_8(如果不设置编码格式,后台获取的数据可能会出现中文乱码)
      UrlEncodedFormEntity urlEntity = new UrlEncodedFormEntity(params, HTTP.UTF_8);
      //设置数据
      httppost.setEntity(urlEntity);
      //使用HttpClient发送网络请求
      HttpResponse response = httpClient.execute(httppost);
      //如果状态码为200,就是正常返回
      if (response.getStatusLine().getStatusCode() == 200) {
        //获取请求的数据(response.getEntity()方法可以获取请求的数据)
        String result = EntityUtils.toString(response.getEntity());
        log.info("result>>>>>   " + result);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
}

后台代码

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/**
 * 用户控制层
 */
@RestController
public class UserRestController {
    private static Logger log = Logger.getLogger(UserRestController.class);
    //@RequestParam(value = "userName", required = true)
    @Autowired
    private UserService userService;
  
    @PostMapping(value = "/api/user")
    public User findUserByName(@RequestParam(value = "name") String name, @RequestParam(value = "age") Integer age) {
            //System.out.println("name>>>>>>>>" + name + "    age>>>>>>>>" + age);
            log.info("name>>>>>>>>" + name + "    age>>>>>>>>" + age);
            return userService.findByName(name);
    }
  
}

代码说明

@RestController注解是用来作用所有的Controller层返回json数据,这个注解是Spring4+才有的,我这里使用Spring Boot 1.5.1.RELEASE版本,已经包含了Spring 4.3.6版本

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<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.1.RELEASE</version>
</parent>

运行结果

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D:\java\jdk\bin\java...
17:36:12.329 [main] DEBUG org.apache.http.impl.conn.BasicClientConnectionManager - Get connection for route {}->http://localhost:8080
17:36:12.379 [main] DEBUG org.apache.http.impl.conn.DefaultClientConnectionOperator - Connecting to localhost:8080
17:36:12.479 [main] DEBUG org.apache.http.impl.conn.BasicClientConnectionManager - Connection can be kept alive indefinitely
17:36:12.479 [main] INFO org.spring.springboot.HttpClientTest - result>>>>>   {"id":1,"userName":"常远","description":"北京工作","city":{"id":1,"provinceId":1,"cityName":"北京","description":"北京工作"},"work":{"id":1,"workAddress":"北京","company":"北京","name":"常远"}}
Process finished with exit code 0

使用HttpClient传递json数据

HttpClient网络请求代码

HttpClient发送json数据,返回json格式数据

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@Test
public void testJson() {
  
    //网络请求地址
    String url = "http://localhost:8080/api/user";
    //请求方式为post请求
    HttpPost httppost = new HttpPost(url);
    //创建网络请求对象
    HttpClient httpClient = new DefaultHttpClient();
    try {
      //请求体是json数据格式
      String json = "{\"id\": \"1\",\"workAddress\": \"北京\",\"company\": \"北京\",\"name\": \"常远\"}";
      //使用StringEntity设置请求体的编码格式为UTF_8(如果不设置编码格式,后台获取的数据可能会出现中文乱码)
      StringEntity stringEntity = new StringEntity(json,"UTF-8");
      //发送json数据必须设置contentType
      stringEntity.setContentType("application/json");
      //设置数据
      httppost.setEntity(stringEntity);
      //使用HttpClient发送网络请求
      HttpResponse response = httpClient.execute(httppost);
      //如果状态码为200,就是正常返回
      if (response.getStatusLine().getStatusCode() == 200) {
        //返回json格式字符串
        String result = EntityUtils.toString(response.getEntity());
        log.info("result>>>>>   " + result);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
}

后台代码

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//consumes的作用是指定请求数据的格式类型,可以同时指定数据格式类型以及字符编码
//produces的作用是指定返回值类型,不但可以设置返回值类型还可以设定返回值的字符编
@PostMapping(value = "/api/user", consumes = "application/json;charset=utf-8", produces = "application/json;charset=utf-8")
public User findUserByName(@RequestBody Work work) {
    log.info("work>>>>>   " + work);
    return userService.findByName("");
}

代码说明

@PostMapping注解中的属性含义

1.consumes的作用是指定请求数据的格式类型,可以同时指定数据格式类型以及字符编码
2.produces的作用是指定返回值类型,不但可以设置返回值类型还可以设定返回值的字符编

consumes和produces属性只是增加对请求数据格式和响应数据格式的校验

运行结果

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D:\java\jdk\bin\java...
17:39:52.636 [main] DEBUG org.apache.http.headers - >> Content-Length: 72
17:39:52.636 [main] DEBUG org.apache.http.headers - >> Content-Type: application/json
17:39:52.636 [main] DEBUG org.apache.http.headers - >> Host: localhost:8080
17:39:52.636 [main] DEBUG org.apache.http.headers - >> Connection: Keep-Alive
17:39:53.836 [main] DEBUG org.apache.http.impl.conn.BasicClientConnectionManager - Connection can be kept alive indefinitely
17:39:53.836 [main] INFO org.spring.springboot.HttpClientTest - result>>>>>   {"id":1,"userName":"常远","description":"北京工作","city":{"id":1,"provinceId":1,"cityName":"北京","description":"北京工作"},"work":{"id":1,"workAddress":"北京","company":"北京","name":"常远"}}
Process finished with exit code 0

博客中若有错误,欢迎大家指出噢,大家共同学习,共同提高,嘿嘿

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