网站框架功能要点

《网站框架功能要点》上有2条评论

1. 错误处理：
   1. session超时，登陆认证失效。(通常仅含出错提示信息）
   2. 404
   3. 出错，（通常包含调试信息）。
   登陆（支持记住用户名、密码）

2. spring 代码示例：
   1. 登录、登出Session操作
   package com.fred.hello.util;

   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpSession;

   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.stereotype.Component;

   @Component(“sessionHelper”)
   public class SessionHelper {

   private static final String IS_LOGIN = “HELLO_IS_LOGIN”;

   @Autowired
   private HttpServletRequest request;

   public void login() {
   HttpSession s = request.getSession();
   s.setAttribute(IS_LOGIN, “true”);
   }

   public static boolean isLogin(HttpServletRequest request) {
   HttpSession s = request.getSession();
   String isLogin = (String)s.getAttribute(IS_LOGIN);
   return “true”.equals(isLogin);
   }

   public void logout() {
   HttpSession s = request.getSession();
   s.removeAttribute(IS_LOGIN);
   }

   }
   2. 登录
   @RequestMapping(value = “/login.do”, method = RequestMethod.GET)
   public String login(ModelMap model) {
   logger.error(“Enter login.do”);
   this.sessionHelper.login();
   model.addAttribute(“message”, “Login Page!”);
   return “login”;
   }
   3. 重定向
   @RequestMapping(value = “/redirect.do”)
   public String handleRequest(ModelMap model) {
   return “redirect:login.do”;
   }
   4. 下载
   private static final String DOWNLOAD_FILE_PATH = “E:\\spring\\download_root\\aopalliance-1.0.jar”;

   @RequestMapping(value = “/download.do”, method = RequestMethod.GET)
   public ResponseEntity handleRequest(ModelMap model) throws IOException {
   File file=new File(DOWNLOAD_FILE_PATH);
   HttpHeaders headers = new HttpHeaders();
   String fileName=new String(“aopalliance-1.0.jar”.getBytes(“UTF-8”), “iso-8859-1”); //为了解决中文名称乱码问题
   headers.setContentDispositionFormData(“attachment”, fileName);
   headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
   return new ResponseEntity(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);
   }
   5. 浏览器直接打开文件
   private static final String SHOWPDF_FILE_PATH = “E:\\spring\\download_root\\HTML5 in Action.pdf”;
   @RequestMapping(value = “/showpdf.do”, method = RequestMethod.GET)
   public ResponseEntity pdfDownload(HttpServletRequest httpServletRequest) throws IOException
   {
   String filename = SHOWPDF_FILE_PATH;
   byte[] pdf1Bytes = FileUtils.readFileToByteArray(new File(SHOWPDF_FILE_PATH));
   HttpHeaders headers = new HttpHeaders();
   headers.setContentType(MediaType.parseMediaType(“application/pdf”));
   headers.add(“content-disposition”, “inline;filename=” + “HTML5 in Action.pdf”); // 另存为的时候，用的名字
   ResponseEntity response = new ResponseEntity(pdf1Bytes, headers, HttpStatus.OK);
   return response;
   }
   6. 日志
   一、添加log4j.properties到src目录，内容为：
   # Attach appender A1 to root. Set root level to Level.DEBUG.
   log4j.rootLogger=DEBUG, A1, A2

   # A1 is set to be a FileAppender sending its output to
   # System.out. However, only error messages and above will be printed
   # in A1 because A1’s threshold is set to Level.ERROR.

   # The fact that the root level is set to Prority.DEBUG only influences
   # log requests made to the root logger. It has no influence on the
   # *appenders* attached to root.

   log4j.appender.A1=org.apache.log4j.ConsoleAppender
   log4j.appender.A1.Threshold=ERROR

   log4j.appender.A1.layout=org.apache.log4j.PatternLayout
   log4j.appender.A1.layout.ConversionPattern=%p [%t] %c{2} (%M:%L) – %m%n

   # Set the level of the logger named “org.apache.log4j.examples” to
   # Level.INFO, attach appender A2.
   log4j.logger.org.apache.log4j.examples=INFO, A2

   # Appender A2 writes to the file “test” in user’s home.
   log4j.appender.A2=org.apache.log4j.FileAppender
   log4j.appender.A2.File=${webapp.root}/logs/log.log

   # Truncate ‘test’ if it aleady exists.
   log4j.appender.A2.Append=false

   # Appender A2 uses the PatternLayout.
   log4j.appender.A2.layout=org.apache.log4j.PatternLayout
   log4j.appender.A2.layout.ConversionPattern=%5r %-5p [%t] %c{2} – %m%n
   二、web.xml添加内容：
   
   log4jConfigLocation classpath:log4j.properties
   
   
   log4jRefreshInterval 1800000
   
   org.springframework.web.util.Log4jConfigListener

   三、类里面定义变量
   private static Logger logger = Logger.getLogger(LoginController.class);

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