一般调对方接口, 对方返回给你的可能是json或者xml数据亦或是流。但是我们同时也会遇到这么一些情况，对方返回给你的可能是html页面代码，也有可能是一段js代码，这个时候controller该如何返回给前端呢？
应用场景：
1、前端调对方接口需要转化为后台调对方接口的方式
2、后台调对方接口返回的就是页面或者js源码
一般最好的解决办法是： 可利用jsoup直接将页面打印到前端，废话不多说了,先上代码：
1.maven 引入httpclient 和 jsoup的jar包
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient --> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.2</version> </dependency> <dependency> <groupId>org.jsoup</groupId> <artifactId>jsoup</artifactId> <version>1.10.3</version> </dependency>
2.HttpUtils工具
public class HttpUtils { private static Logger Log = LoggerFactory.getLogger(HttpUtils.class); // 1.使用get方式发送报文 public static String getData(String url) { CloseableHttpClient client = HttpClients.createDefault(); HttpGet get = new HttpGet(url); try{ CloseableHttpResponse response = client.execute(get); int statusCode = response.getStatusLine().getStatusCode(); if(statusCode==200){ Log.info("远程调用成功.line={}",response.getStatusLine()); HttpEntity entity = response.getEntity(); return EntityUtils.toString(entity,"UTF-8"); } return null; }catch (IOException e){ Log.error("远程调用失败.e={}",e.getMessage()); } return null; } public static String post(String type,String url,String data){ String result = ""; switch (type){ case "xml": result = postData(url,data,ContentType.APPLICATION_XML.toString()); break; case "json": result = postData(url,data,ContentType.APPLICATION_JSON.toString()); break; default: break; } return result; } // 使用POST方法发送XML或者json数据 public static String postData(String url, String xmlData,String contentType){ CloseableHttpClient client = HttpClients.createDefault(); HttpPost post = new HttpPost(url); post.addHeader("Content-type",contentType); try{ StringEntity entity = new StringEntity(xmlData); post.setEntity(entity); CloseableHttpResponse response = client.execute(post); int statusCode = response.getStatusLine().getStatusCode(); if(statusCode==200){ Log.info("远程调用成功.line={}",response.getStatusLine()); HttpEntity responseEntity = response.getEntity(); return EntityUtils.toString(responseEntity); } }catch (IOException e){ Log.error("远程调用失败.e={}",e.getMessage()); } return null; } // 使用POST方法发送FORM表单数据 public static String postForm(String url, Map<String,String> map){ CloseableHttpClient client = HttpClients.createDefault(); HttpPost post = new HttpPost(url); post.addHeader("Content-type",ContentType.APPLICATION_FORM_URLENCODED.toString()); try{ List<BasicNameValuePair> list = new ArrayList<>(); for(Map.Entry<String,String> entry : map.entrySet()){ list.add(new BasicNameValuePair(entry.getKey(),entry.getValue())); } UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(list); post.setEntity(urlEncodedFormEntity); CloseableHttpResponse response = client.execute(post); int statusCode = response.getStatusLine().getStatusCode(); if(statusCode==200){ Log.info("远程调用成功.line={}",response.getStatusLine()); HttpEntity responseEntity = response.getEntity(); return EntityUtils.toString(responseEntity); } }catch (IOException e){ Log.error("远程调用失败.e={}",e.getMessage()); } return null; } }3.Controller 返回html或者js给前端
@Controller public class HtmlController { private static final Logger LOGGER = LoggerFactory.getLogger(HtmlController.class); @RequestMapping("/clientToHtml") public void clientToHtml(HttpServletRequest request, HttpServletResponse response) throws IOException { String body = HttpUtils.getData("http://www.baidu.com");//body为获取的html代码 Document doc = Jsoup.parse(body); LOGGER.info("返回页面内容：",doc.outerHtml()); response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); out.println(doc.outerHtml()); } @RequestMapping("/clientToJs") public String clientToJs(HttpServletRequest request,HttpServletResponse response) throws IOException { Map<String,String> map = new HashMap<>(); map.put("type","1"); String body = HttpUtils.postForm("http://localhost:28082/demo/postJs",map);//body为获取的js代码 LOGGER.info("返回页面内容：body={}",body); response.setContentType("text/html;charset=UTF-8"); response.getWriter().write(body); return "index"; } @RequestMapping("/postJs") @ResponseBody public String postJs(String type){ LOGGER.info("接收到请求.type=1",type); StringBuilder sb = new StringBuilder(); sb.append("<script>"); sb.append("document.write(Date());"); sb.append("</script>"); return sb.toString(); } }
4. index页面
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <h2>Hello</h2> </body> </html>页面效果：
Controller返回html效果：
Js返回效果
