标签：需要 eve post lse creat ace toc div getpath
场景：调用接口完成某项操作，但是接口是强登录的，需要cookie, 且cookie会过期；服务器会限制登录的次数，如果一个账号频繁登录，则在短时间内无法正常登录，因此无法做到每调用接口一次就登录一次，且这样的效率也会比较低；
方法： 采用httpClient获取cookie, 并在接口上加入cookie校验；
核心代码：
0. 需要加入的jar包
1 import org.apache.commons.lang.StringUtils; 2 import org.apache.commons.httpclient.HttpClient; 3 import org.apache.commons.httpclient.methods.GetMethod; 4 import org.apache.http.Header; 5 import org.apache.http.HttpResponse; 6 import org.apache.http.HttpStatus; 7 import org.apache.http.StatusLine; 8 import org.apache.http.client.CookieStore; 9 10 import org.apache.http.client.HttpClient; 11 import org.apache.http.client.methods.HttpGet; 12 import org.apache.commons.httpclient.methods.GetMethod; 13 14 import org.apache.http.client.methods.HttpPost; 15 16 import org.apache.http.cookie.Cookie; 17 import org.apache.http.impl.client.BasicCookieStore; 18 19 import org.apache.http.impl.client.HttpClients; 20 import org.apache.http.protocol.BasicHttpContext; 21 import org.apache.http.protocol.HttpContext;
需要导入pom.xml文件的依赖
1 <dependency> 2 <groupId>org.apache.httpcomponents</groupId> 3 <artifactId>httpclient</artifactId> 4 <version>4.5.5</version> 5 </dependency> 6 <dependency> 7 <groupId>commons-httpclient</groupId> 8 <artifactId>commons-httpclient</artifactId> 9 <version>3.1</version> 10 </dependency>
1. 获取cookie， 其中
getUrl(loginUrl, username, password); 是将url进行拼接，loginUrl 加上登陆需要的参数拼接为一个请求
public String getCookies(String username, String password){ CookieStore cookieStore = new BasicCookieStore(); HttpContext localContext = new BasicHttpContext(); localContext.setAttribute(COOKIE_STORE, cookieStore); HttpClient client = HttpClients.createDefault(); String authUrl = getUrl(loginUrl, username, password); System.out.println("authUrl = " + authUrl); HttpPost post = new HttpPost(authUrl); try { response = client.execute(post, localContext); StatusLine statusLine = response.getStatusLine(); int statusCode = statusLine.getStatusCode(); System.out.println("first execute code :" + statusCode); if(statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY){ Header firsRedirectHeader = response.getFirstHeader("location"); String firstRedirectUrl = firsRedirectHeader.getValue(); HttpGet get = new HttpGet(firstRedirectUrl); HttpResponse getResponse = client.execute(get, localContext); StatusLine statusLine2 = getResponse.getStatusLine(); int statusCode2 = statusLine2.getStatusCode(); System.out.println("second execute code :" + statusCode2); System.out.println("cookie :" + cookieStore.getCookies()); List<Cookie> cookieList = cookieStore.getCookies(); StringBuffer tmpCookie = new StringBuffer(); for(int i = 0 ; i < cookieList.size(); i++) { tmpCookie.append(cookieList.get(i).getName()).append("="); tmpCookie.append(cookieList.get(i).getValue()).append(";"); tmpCookie.append("domain=").append(cookieList.get(i).getDomain()).append(";"); tmpCookie.append("path=").append(cookieList.get(i).getPath()).append(";"); } get.releaseConnection(); return tmpCookie.toString(); } } catch (IOException e) { e.printStackTrace(); }finally { if(post != null){ post.releaseConnection(); } } return "-1"; }
2. 获取到有效的cookie, 因为第一步获取到cookie后，cookie在一段时间内可能会失效，因此为了后面接口中带入有效的cookie, 这里还需要该函数来获取真正有效的cookie;
public String getValidCookie(String cookie){ if(cookie.contains("DICT_SESS")){ return cookie; }else{ Login login = new Login(); String validCookie = login.getCookies(username, password); return validCookie; } }
3. 真正执行接口的代码， for循环2次，第一次是去请求接口，如果接口返回的结果是403权限被拒绝，则需要调用login.getValidCookie()方法登录一次，获取真正的cookie.，然后进行第二次接口请求；
如果接口返回的结果是0， 则表示cookie依然有效，则直接返回true; 其中参数url是需要真正请求的接口；
1 public Boolean executeMethod(String url) { 2 String result = "-1"; 3 for(int i = 0; i < 2; i++) { 4 GetMethod getMethod = new GetMethod(url); 5 getMethod.setRequestHeader("cookie", cookie); 6 try { 7 httpClient.executeMethod(getMethod); 8 System.out.println("method result = " + getMethod.getResponseBodyAsString()); 9 result = getMethod.getResponseBodyAsString(); 10 } catch (IOException e) { 11 e.printStackTrace(); 12 } 13 JSONObject obj = JSONObject.parseObject(result); 14 if ("0".equals(obj.get("err").toString())) { 15 return true; 16 }else if ("403".equals(obj.get("err").toString())) { 17 cookie = login.getValidCookie(cookie); 18 continue; 19 }else{ 20 return false; 21 } 22 } 23 return false; 24 25 }
4. 在类加载的时候先登录一次，保存cookie,且是全局变量；则在第3步更新cookie的时候，就可以更新该变量；
1 Login login = new Login();
2 private String cookie = login.getCookies(username, password);
3 HttpClient httpClient = new HttpClient();
总结： 第三步判断cookie失效重新请求的实现方法有点不太好，希望大家多多交流；
java 模拟web登陆httpClient并保存cookie
标签：需要 eve post lse creat ace toc div getpath
原文地址：https://www.cnblogs.com/leavescy/p/11348733.html
