SpringBoot使用RestTemplate
设置pom引用
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.itstudy</groupId> <artifactId>demo</artifactId> <version>1.0.0-SNAPSHOT</version> <name>demo</name> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</version> </parent> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.30</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>
2.增加配置类
import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.client.ClientHttpRequestFactory; import org.springframework.http.client.SimpleClientHttpRequestFactory; import org.springframework.web.client.RestTemplate; import org.springframework.http.converter.StringHttpMessageConverter; import java.nio.charset.Charset; @Configuration public class RestTemplateConfig { @Bean public RestTemplate restTemplate(ClientHttpRequestFactory factory){ RestTemplate restTemplate= new RestTemplate(factory); // 支持中文编码 restTemplate.getMessageConverters().set(1, new StringHttpMessageConverter(Charset.forName("UTF-8"))); return restTemplate; } @Bean public ClientHttpRequestFactory simpleClientHttpRequestFactory(){ SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory(); factory.setReadTimeout(5000);//单位为ms factory.setConnectTimeout(5000);//单位为ms return factory; } }
3.在service中使用
import com.alibaba.fastjson.JSONObject; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.HttpEntity; import org.springframework.http.HttpHeaders; import org.springframework.http.MediaType; import org.springframework.web.client.RestTemplate; public class RestTestService { @Autowired private RestTemplate restTemplate; public void test(){ String paras = "data"; String url="http://127.0.0.1"; HttpHeaders headers = new HttpHeaders(); MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8"); headers.setContentType(type); headers.add("Accept", MediaType.APPLICATION_JSON.toString()); JSONObject jsonObj = JSONObject.parseObject(paras); HttpEntity<String> formEntity = new HttpEntity<String>(jsonObj.toString(), headers); String result = restTemplate.postForObject(url, formEntity, String.class); } public void testExchage(){ String url=""; HttpHeaders httpHeaders = new HttpHeaders(); httpHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON_UTF8)); Map<String,String> postData = new HashMap<String,String>(); postData.put("param1","123"); postData.put("param2","abc"); //发送json字符串 String content = JSON.toJSONString(postData); HttpEntity<String> httpEntity = new HttpEntity<String>(content, httpHeaders); try { ResponseEntity<String> responseEntity = restTemplate.exchange(url, HttpMethod.POST, httpEntity, String.class); Map<String,String> mapResponse = JSON.parseObject(responseEntity.getBody(),HashMap.class); }catch (Exception ex){ //进行错误处理 } } public void testExchage2(){ String url=""; HttpHeaders httpHeaders = new HttpHeaders(); httpHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON_UTF8)); //参数放入一个map中，restTemplate不能用hashMap MultiValueMap<String,String> param = new LinkedMultiValueMap<String, String>(); //将请求参数放入map中 param.add("param1","abc"); param.add("param2","123"); //将参数和header组成一个请求 HttpEntity<MultiValueMap<String,String>> httpEntity = new HttpEntity<MultiValueMap<String,String>>(param,headers); try { ResponseEntity<String> responseEntity = restTemplate.exchange(url, HttpMethod.POST, httpEntity, String.class); //responseEntity.getBody()进行其它处理 }catch (Exception ex){ //进行错误处理 } } }
4.应用启动
import org.springframework.boot.Banner; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class App { public static void main(String[] args) { SpringApplication app = new SpringApplication(App.class); //关闭banner app.setBannerMode(Banner.Mode.OFF); app.run(args); } }
另外注意RestTemplate默认 如果返回状态不是200则会报错，因此这个要进行捕获
/判断接口返回是否为200 public static Boolean ping(){ String url = domain + "/it/ping"; try{ ResponseEntity<String> responseEntity = template.getForEntity(url,String.class); HttpStatus status = responseEntity.getStatusCode();//获取返回状态 return status.is2xxSuccessful();//判断状态码是否为2开头的 }catch(Exception e){ return false; //502 ,500是不能正常返回结果的，需要catch住，返回一个false } }
或者进行自定义处理
import java.io.IOException; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.client.ClientHttpRequestFactory; import org.springframework.http.client.ClientHttpResponse; import org.springframework.http.client.SimpleClientHttpRequestFactory; import org.springframework.web.client.ResponseErrorHandler; import org.springframework.web.client.RestTemplate; @Configuration public class RestTemplateConfig { @Bean public RestTemplate restTemplate(ClientHttpRequestFactory factory) throws Exception { RestTemplate restTemplate = new RestTemplate(factory); ResponseErrorHandler responseErrorHandler = new ResponseErrorHandler() { @Override public boolean hasError(ClientHttpResponse clientHttpResponse) throws IOException { return true; } @Override public void handleError(ClientHttpResponse clientHttpResponse) throws IOException { } }; restTemplate.setErrorHandler(responseErrorHandler); return restTemplate; } @Bean public ClientHttpRequestFactory simpleClientHttpRequestFactory(){ SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory(); //读取超时5秒 factory.setReadTimeout(5000); //连接超时15秒 factory.setConnectTimeout(15000); return factory; } }
