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导入坐标
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.4</version> </dependency>
//1、使用HttpClient发起Get请求
public class DoGET {
public static void main(String[] args) throws Exception {
// 创建Httpclient对象,相当于打开了浏览器
CloseableHttpClient httpclient = HttpClients.createDefault();
// 创建HttpGet请求，相当于在浏览器输入地址
HttpGet httpGet = new HttpGet("http://www.baidu.com/");
CloseableHttpResponse response = null;
try {
// 执行请求，相当于敲完地址后按下回车。获取响应
response = httpclient.execute(httpGet);
// 判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
// 解析响应，获取数据
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
} finally {
if (response != null) {
// 关闭资源
response.close();
}
// 关闭浏览器
httpclient.close();
}
}
}
//2、使用HttpClient发起带参数的Get请求
public class DoGETParam {
public static void main(String[] args) throws Exception {
// 创建Httpclient对象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 创建URI对象，并且设置请求参数
URI uri = new URIBuilder("http://www.baidu.com/s").setParameter("wd", "java").build();
// 创建http GET请求
HttpGet httpGet = new HttpGet(uri);
// HttpGet get = new HttpGet("http://www.baidu.com/s?wd=java");
CloseableHttpResponse response = null;
try {
// 执行请求
response = httpclient.execute(httpGet);
// 判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
// 解析响应数据
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
} finally {
if (response != null) {
response.close();
}
httpclient.close();
}
}
}
//3、使用HttpClient发起POST请求
public class DoPOST {
public static void main(String[] args) throws Exception {
// 创建Httpclient对象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 创建http POST请求
HttpPost httpPost = new HttpPost("http://www.oschina.net/");
// 把自己伪装成浏览器。否则开源中国会拦截访问
httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");
CloseableHttpResponse response = null;
try {
// 执行请求
response = httpclient.execute(httpPost);
// 判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
// 解析响应数据
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
} finally {
if (response != null) {
response.close();
}
// 关闭浏览器
httpclient.close();
}
}
}
//4、使用HttpClient发起带有参数的POST请求
public class DoPOSTParam {
public static void main(String[] args) throws Exception {
// 创建Httpclient对象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 创建http POST请求，访问开源中国
HttpPost httpPost = new HttpPost("http://www.oschina.net/search");
// 根据开源中国的请求需要，设置post请求参数
List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);
parameters.add(new BasicNameValuePair("scope", "project"));
parameters.add(new BasicNameValuePair("q", "java"));
parameters.add(new BasicNameValuePair("fromerr", "8bDnUWwC"));
// 构造一个form表单式的实体
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);
// 将请求实体设置到httpPost对象中
httpPost.setEntity(formEntity);
CloseableHttpResponse response = null;
try {
// 执行请求
response = httpclient.execute(httpPost);
// 判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
// 解析响应体
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
} finally {
if (response != null) {
response.close();
}
// 关闭浏览器
httpclient.close();
}
}
}导入坐标
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
创建RestTemplate对象
@Configuration//加上这个注解作用，可以被Spring扫描
public class RestTemplateConfig {
/**
* 创建RestTemplate对象，将RestTemplate对象的生命周期的管理交给Spring
* @return
*/
@Bean
public RestTemplate restTemplate(){
RestTemplate restTemplate = new RestTemplate();
//主要解决中文乱码
restTemplate.getMessageConverters().set(1, new StringHttpMessageConverter(StandardCharsets.UTF_8));
return restTemplate;
}
}RestTempController
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
@RestController
@RequestMapping("/consumer")
public class ConsumerController {
// 从Spring的容器中获取restTemplate
@Resource
private RestTemplate restTemplate;
/**
* 通过Get请求，保存数据
*/
@GetMapping("/{id}")
public ResponseEntity<String> findById(@PathVariable Integer id){
//发起远程请求:通过RestTemplate发起get请求
ResponseEntity<String> entity = restTemplate.getForEntity("http://localhost:8090/goods2/1", String.class);
System.out.println("entity.getStatusCode():"+entity.getStatusCode());
System.out.println(entity.getBody());
return entity;
}
/**
* 通过Post请求，保存数据
*/
@PostMapping
public ResponseEntity<String> saveGoods(@RequestBody Goods goods){
//通过RestTemplate发起远程请求
/**
* 第一个参数：远程地址URI
* 第二个参数：数据
* 第三个参数：返回值类型
*/
ResponseEntity<String> entity = restTemplate.postForEntity("http://localhost:8090/goods2", goods, String.class);
System.out.println("entity.getStatusCode():"+entity.getStatusCode());
System.out.println(entity.getBody());
return entity;
}
@PutMapping
public ResponseEntity<String> updateGoods(@RequestBody Goods goods){
restTemplate.put("http://localhost:8090/goods2",goods);
return new ResponseEntity<>("修改成功", HttpStatus.OK);
}
@DeleteMapping("/{id}")
public ResponseEntity<String> deleteById(@PathVariable Integer id){
restTemplate.delete("http://localhost:8090/goods2/"+id);
return new ResponseEntity<>("删除成功", HttpStatus.OK);
}
}只用maven不用springboot框架时只需要导入依赖到pom文件
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> </dependency>
直接new RestTemplate()对象使用即可
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