{"id":2430,"date":"2020-10-25T13:33:42","date_gmt":"2020-10-25T05:33:42","guid":{"rendered":"http:\/\/admin.evshou.com\/?p=2430"},"modified":"2020-10-26T14:32:38","modified_gmt":"2020-10-26T06:32:38","slug":"2020javaweb%e6%95%99%e7%a8%8b%ef%bc%9afilter%e8%bf%87%e6%bb%a4%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.9713job.com\/?p=2430","title":{"rendered":"2020Javaweb\u6559\u7a0b\uff1afilter\u8fc7\u6ee4\u5668"},"content":{"rendered":"

filter\u8fc7\u6ee4\u5668<\/p>\n

====================================<\/p>\n

\u4ec0\u4e48\u662f\u8fc7\u6ee4\u5668\uff1a<\/span><\/strong>
\nFilter\u4e5f\u79f0\u4e4b\u4e3a\u8fc7\u6ee4\u5668\uff0c\u5b83\u662fServlet\u6280\u672f\u4e2d\u6700\u6fc0\u52a8\u4eba\u5fc3\u7684\u6280\u672f\uff0cWEB\u5f00\u53d1\u4eba\u5458\u901a\u8fc7Filter\u6280\u672f\uff0c
\n\u5bf9web\u670d\u52a1\u5668\u7ba1\u7406\u7684\u6240\u6709web\u8d44\u6e90\uff1b\u4f8b\u5982Jsp\uff0cServlet\uff0c\u9759\u6001\u56fe\u7247\u6587\u4ef6\u6216\u9759\u6001html\u6587\u4ef6\u7b49<\/p>\n


\n\u8fdb\u884c\u62e6\u622a\uff0c\u4ece\u800c\u5b9e\u73b0\u4e00\u4e9b\u7279\u6b8a\u7684\u529f\u80fd\u3002
\n\u4f8b\u5982\u5b9e\u73b0URL\u7ea7\u522b\u7684\u6743\u9650\u8bbf\u95ee\u63a7\u5236\u3001\u8fc7\u6ee4\u654f\u9a82\u8bcd\u6c47\u3001\u538b\u7f29\u54cd\u5e94\u4fe1\u606f\u7b49\u4e00\u4e9b\u9ad8\u7ea7\u529f\u80fd\u3002
\nServletAPI\u4e2d\u63d0\u4f9b\u4e86\u4e00\u4e2aFilter\u63a5\u53e3\uff0c\u5f00\u53d1web\u5e94\u7528\u65f6\uff0c\u5982\u679c\u7f16\u5199\u7684Java\u7c7b\u5b9e\u73b0\u4e86\u8fd9\u4e2a\u63a5\u53e3\uff0c
\n\u5219\u628a\u8fd9\u4e2ajava\u7c7b\u79f0\u4e4b\u4e3a\u8fc7\u6ee4\u5668Filter\u3002\u901a\u8fc7Filter\u6280\u672f\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u5b9e\u73b0\u7528\u6237\u5728\u8bbf\u95ee\u67d0\u4e2a
\n\u76ee\u6807\u8d44\u6e90\u4e4b\u95f4\uff0c\u5bf9\u8bbf\u95ee\u7684\u8bf7\u6c42\u548c\u54cd\u5e94\u8fdb\u884c\u680f\u622a.<\/p>\n

\u5982\u4f55\u7f16\u5199\u8fc7\u6ee4\u5668\uff1a<\/span><\/strong>
\n1.\u7f16\u5199java\u7c7b\u5b9e\u73b0Filter\u63a5\u53e3(servlet)
\n2.\u91cd\u5199doFilter\u65b9\u6cd5<\/p>\n

public class TestFilter implements Filter {\r\n    public void destroy() {\r\n    }\r\n\r\n    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {\r\n        chain.doFilter(req, resp);\r\n    }\r\n\r\n    public void init(FilterConfig config) throws ServletException {\r\n\r\n    }\r\n\r\n}<\/pre>\n
xml\u914d\u7f6e<\/span>
\n\u5728web.xml\u4e2d\u8fdb\u884c\u8fc7\u6ee4\u5668\u7684\u914d\u7f6e
\n<filter>
\n\u540d\u79f0
\n<filter-name>sf<filter-name>
\n<filter-class>\u5305\u540d.\u7c7b\u540d<filter-class>
\n<\/filter>
\n\u6620\u5c04\u8def\u5f84\u914d\u7f6e
\n<filter-mapping>
\n\u540d\u79f0
\n<filter-name>sf<filter-name>
\n\u8fc7\u6ee4\u7684url\u5339\u914d\u89c4\u5219\u548cservlet\u7684\u4e00\u6a21\u4e00\u6837
\n<url-pattern>\/*<\/url-pattern>
\n<filter-mapping><\/p>\n
====================================
\nFilter\u6ce8\u89e3\u914d\u7f6e<\/span><\/p>\n
\u6ce8\u89e3\u5f0f\u914d\u7f6e
\n\u5728\u81ea\u5b9a\u4e49\u7684Filter\u7c7b\u4e0a\u4f7f\u7528\u6ce8\u89e3@WebFilter(“\/*”);<\/p>\n
\u4f18\u5148\u7ea7
\n\u5982\u679c\u4e3a\u6ce8\u89e3\u7684\u8bdd\uff0c\u662f\u6309\u7167\u7c7b\u540d\u7684\u5b57\u7b26\u4e32\u987a\u5e8f\u8fdb\u884c\u8d77\u4f5c\u7528\u7684
\n\u5982\u679cweb.xml\uff0c\u6309\u7167filter-mapping\u6ce8\u518c\u987a\u5e8f\uff0c\u4ece\u4e0a\u5f80\u4e0b
\nweb.xml\u914d\u7f6e\u9ad8\u4e8e\u6ce8\u89e3\u65b9\u5f0f
\n\u5982\u679c\u4e0d\u540c\u5305\u3001\u540c\u540d\u7684filter\uff0c\u6309\u7167\u5305\u540d\u5728\u6392\u5e8f<\/p>\n
====================================
\n\u8fc7\u6ee4\u5668\u7684\u521d\u59cb\u5316\u53c2\u6570<\/span>
\n\u5728\u8fc7\u6ee4\u5668\u7684\u521b\u5efa\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u4f20\u9012\u521d\u59cb\u5316\u53c2\u6570<\/p>\n
\u7b2c\u4e00\u79cd\uff1a\u57fa\u4e8e\u6ce8\u89e3\u7684
\n@WebFilter(initParams={@WebInitParam(name=”version”,value=”1.0″)})<\/p>\n
\u7b2c\u4e8c\u79cd\uff1aweb.xml
\n<filter>
\n<init-param>
\n<param-name>version<param-name>
\n<param-value>1.0<param-value>
\n<init-param>
\n<filter><\/p>\n
\u8fc7\u6ee4\u5668\u4f18\u70b9
\n\u53ef\u4ee5\u5b9e\u73b0web\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u9884\u5904\u7406\u548c\u540e\u671f\u5904\u7406\u903b\u8f91
\n====================================
\n\u9759\u6001\u81ea\u52a8\u767b\u5f55<\/span><\/strong><\/p>\n
loginServlet:<\/span>
\nHttpSeesion s=request.getSession();
\n\/\/\u6536\u53c2
\nString uname=request.getParameter(“uname”);
\nString password=request.getParameter(“password”);
\nif(“admin”.equals(uname)&&”admin888″.equals(password)){
\ns.setAttribute(“uname”,uname);
\nCookie cookie=new Cookie(“userinfo”,uname+”#”+password);
\ncookie.setPath(“\/”);
\ncookie.setMaxAge(60*60*24*7);
\nresponse.addCookie(cookie);
\nresponse.sendRedirect(“\/\u9879\u76ee\/\u6b22\u8fce\u9875.html”);
\n}else{
\nresponse.sendRedirect(“\/\u9879\u76ee\/bad.html”);
\n}<\/p>\n
loginFilter:<\/span>
\n@WebFilter(value=”\/login.html”)
\ndoFilter()\u65b9\u6cd5{
\n\/\/1.session\u91cc\u53d6session
\nHttpServletRequest request=(HttpServletRequest)req;
\nHttpServletResponse response=(HttpServletResponse)resp;
\nHttpSeesion s=request.getSession();
\nString uname=(String)session.getAttribute(“uname”);<\/p>\n
if(uname!=null){
\nresponse.sendRedirect(“\/\u9879\u76ee\/\u6b22\u8fce\u9875.html”);
\n}else{
\nCookie[] cookies=request.getCookies();
\nif(cookies!=null){
\nfor(Cookie cookie:cookies){
\nString names=cookie.getName();<\/p>\n
\/\/\u5982\u679c\u5f53\u524dcookie\u91cc\u6709userinfo\u7684name\u3001\u8bc1\u660e\u7528\u6237\u767b\u5f55\u8fc7
\nif(names.equals(“userinfo”)){
\nString value=cookie.getValue();
\nString[] split=value.split(“#”);
\nsession.setAttribute(“uname”,split[0]);
\nresponse.sendRedirect(“\/\u9879\u76ee\/\u6b22\u8fce\u9875.html”);
\n}
\n}
\n}
\n}<\/p>\n
\/\/2.cookie\u53d6\u7528\u6237\u540d\u548c\u5bc6\u7801
\nchain.doFilter(req,resp);
\n}<\/p>\n
====================================
\n\u52a8\u6001\u81ea\u52a8\u767b\u5f55<\/span><\/strong><\/p>\n
loginFilter:<\/span><\/p>\n
@WebFilter(filterName = \"LoginFilter\",value = \"\/login.html\")<\/pre>\n
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {\r\n    HttpServletRequest request=(HttpServletRequest)req;\r\n    HttpServletResponse response=(HttpServletResponse)resp;\r\n    HttpSession session = request.getSession();\r\n    Users users = (Users) session.getAttribute(\"users\");\r\n    if (users != null) {\r\n        response.sendRedirect(\"\/day2\/home.html\");\r\n    }else{\r\n        Cookie[] cookies = request.getCookies();\r\n        if (cookies != null) {\r\n            for (Cookie cookie : cookies) {\r\n                String name = cookie.getName();\r\n                if(name.equals(\"userinfo\")){\r\n                    String value = cookie.getValue();\r\n                    String[] split = value.split(\"#\");\r\n                    UsersService us=new UsersServiceImpl();\r\n                    Users users1 = us.checkUsers(split[0], split[1]);\r\n                    if (users1 != null) {\r\n                        response.sendRedirect(\"\/day2\/home.html\");\r\n                    }else{\r\n                        response.sendRedirect(\"\/day2\/filed.html\");\r\n                    }\r\n                }\r\n            }\r\n        }chain.doFilter(request,response);\r\n    }\r\n}<\/pre>\n
loginServlet:<\/span><\/pre>\n
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n    request.setCharacterEncoding(\"utf-8\");\r\n    response.setContentType(\"text\/html;charset=utf-8\");\r\n    response.setCharacterEncoding(\"utf-8\");\r\n    String username = request.getParameter(\"username\");\r\n    String password = request.getParameter(\"password\");\r\n    HttpSession session = request.getSession();\r\n    UsersServiceImpl usi=new UsersServiceImpl();\r\n    Users users = usi.checkUsers(username, password);\r\n    if (users != null) {\r\n        session.setAttribute(\"users\",users);\r\n        session.setAttribute(\"username\",username);\r\n        Cookie cookie=new Cookie(\"userinfo\",username+\"#\"+password);\r\n        cookie.setPath(\"\/\");\r\n        cookie.setMaxAge(60*60*24*7);\r\n        response.addCookie(cookie);\r\n        response.sendRedirect(\"\/day2\/home.html\");\r\n    }else{\r\n        response.sendRedirect(\"\/day2\/filed.html\");\r\n    }\r\n}<\/pre>\n
====================================
\n\u8fc7\u6ee4\u810f\u8bcd<\/span><\/strong><\/p>\n
dirtyServlet\uff1a<\/p>\n
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {\r\n    HttpServletRequest request=(HttpServletRequest)req;<\/span>\r\n    chain.doFilter(new dir(request), resp);\r\n}\r\nstatic class dir extends HttpServletRequestWrapper<\/span> {\r\n    List<String> list=new ArrayList<String>();\r\n\r\n    public dir(HttpServletRequest request) {\r\n        super(request);\r\n        list.add(\"\u738b\u516b\u86cb\");\r\n        list.add(\"\u4e8c\u72d7\u5b50\");\r\n        list.add(\"sb\");\r\n        list.add(\"SB\");\r\n    }\r\n\r\n    @Override\r\n    public String getParameter(String name) {\r\n        String values = super.getParameter(name);\r\n        for (String s : list) {\r\n            if(values.equals(s)){\r\n                values=\"***\";\r\n            }\r\n        }\r\n        return values;\r\n    }\r\n}<\/pre>\n
====================================
\n\u8bbe\u7f6e\u7f16\u7801<\/p>\n
CharacterFilter\uff1a
\n@WebFilter(filterName = “CharacterFilter”,value = “\/*”)
\nreq.setCharacterEncoding(“UTF-8”);
\nresp.setCharacterEncoding(“UTF-8”);
\nresp.setContentType(“text\/html;charset=utf-8”);<\/p>\n
====================================
\n\u6743\u9650\u7ba1\u7406<\/span><\/strong><\/p>\n
1.\u9996\u5148\u5199\u4e09\u5c42\u67b6\u6784(dao\u3001entity\u3001service)\u4ee5\u53ca\u767b\u5f55\u9875\u9762
\n2.loginFilter\uff1a<\/span><\/p>\n
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {\r\n    HttpServletRequest request=(HttpServletRequest)req;\r\n    HttpServletResponse response=(HttpServletResponse)resp;\r\n    HttpSession session = request.getSession();\r\n    Users users = (Users) session.getAttribute(\"users\");\r\n    if (users != null) {\r\n        response.sendRedirect(\"\/day2\/home.html\");\r\n    }else{\r\n        Cookie[] cookies = request.getCookies();\r\n        if (cookies != null) {\r\n            for (Cookie cookie : cookies) {\r\n                String name = cookie.getName();\r\n                if(name.equals(\"userinfo\")){\r\n                    String value = cookie.getValue();\r\n                    String[] split = value.split(\"#\");\r\n                    UsersService us=new UsersServiceImpl();\r\n                    Users users1 = us.checkUsers(split[0], split[1]);\r\n                    if (users1 != null) {\r\n                        if(users1.getAcc()==1){\r\n                            response.sendRedirect(\"\/day2\/admin\");\r\n                        }else {\r\n                            response.sendRedirect(\"\/day2\/getAll\");\r\n                        }\r\n                    }else{\r\n                        response.sendRedirect(\"\/day2\/filed.html\");\r\n                    }\r\n                }\r\n            }\r\n        }chain.doFilter(request,response);\r\n    }\r\n}<\/pre>\n
3.loginServlet\uff1a<\/span><\/p>\n
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n    String username = request.getParameter(\"username\");\r\n    String password = request.getParameter(\"password\");\r\n    UsersServiceImpl usi=new UsersServiceImpl();\r\n    Users users = usi.checkUsers(username, password);\r\n    if (users != null) {\r\n        Cookie cookie=new Cookie(\"userinfo\",username+\"#\"+password);\r\n        cookie.setPath(\"\/\");\r\n        cookie.setMaxAge(60*60*24*7);\r\n        response.addCookie(cookie);\r\n        if(users.getAcc()==1) {\r\n            response.sendRedirect(\"\/day2\/admin\");\r\n        }else{\r\n            response.sendRedirect(\"\/day2\/getAll\");\r\n        }\r\n    }else{\r\n        response.sendRedirect(\"\/day2\/filed.html\");\r\n    }\r\n}<\/pre>\n
4.getAllServlet\uff1a<\/p>\n
EmpService empService=new EmpServiceImpl();
\nList<Emp> allEmp = empService.getAllEmp();
\nPrintWriter writer = response.getWriter();<\/p>\n
writer.println(“<html>”);
\nwriter.println(“<head>”);
\nwriter.println(“<meta charset=’utf-8′>”);
\nwriter.println(“<title>\u67e5\u8be2\u6240\u6709<\/title>”);
\nwriter.println(“<\/head>”);
\nwriter.println(“<body>”);
\nfor (Emp emp : allEmp) {
\nwriter.println(“<div>”+emp.getId()+”\\n”+emp.getUname()+”\\n”+emp.getAge()+”\\n”+emp.getSex()+”\\n”+emp.getMobile()+”<\/div>”);
\n}
\nwriter.println(“<\/body>”);
\nwriter.println(“<\/html>”);<\/p>\n
5.adminServlet\uff1a<\/p>\n
EmpService empService=new EmpServiceImpl();
\nList<Emp> allEmp = empService.getAllEmp();
\nPrintWriter writer = response.getWriter();<\/p>\n
writer.println(“<html>”);
\nwriter.println(“<head>”);
\nwriter.println(“<meta charset=’utf-8′>”);
\nwriter.println(“<title>\u67e5\u8be2\u6240\u6709<\/title>”);
\nwriter.println(“<\/head>”);
\nwriter.println(“<body>”);
\nfor (Emp emp : allEmp) {
\nwriter.println(“<div>”+emp.getId()+”\\n”+emp.getUname()+”\\n”+emp.getAge()+”\\n”+emp.getSex()+”\\n”+emp.getMobile()+
\n“<\/div><a href=’#’>\u4fee\u6539<\/a>&nbsp;&nbsp;<a href='”+”\/day11\/delete?no=”+emp.getId()+”‘>\u5220\u9664<\/a>”);
\n}
\nwriter.println(“<\/body>”);
\nwriter.println(“<\/html>”);<\/p>\n
6.deleteServlet\uff1a<\/p>\n
String no = request.getParameter(“no”);
\nEmpService empService=new EmpServiceImpl();
\nint delete = empService.delete(Integer.valueOf(no));
\nif (delete > 0) {
\nresponse.sendRedirect(“\/day11\/admin”);
\n}
\n====================================<\/p>\n","protected":false},"excerpt":{"rendered":"
filter\u8fc7\u6ee4\u5668 ==================================== \u4ec0\u4e48\u662f\u8fc7\u6ee4\u5668\uff1a  […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2430","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2430","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2430"}],"version-history":[{"count":1,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2430\/revisions"}],"predecessor-version":[{"id":2431,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2430\/revisions\/2431"}],"wp:attachment":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2430"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}