1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

/**

*

* @author geloin

* @date 2012-4-10 下午2:37:38

*/

package com.test.spring.filter;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.FilterChain;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.filter.OncePerRequestFilter;

/**

* 登录过滤

*

* @author geloin

* @date 2012-4-10 下午2:37:38

*/

public class SessionFilter extends OncePerRequestFilter {

/*

* (non-Javadoc)

*

* @see

* org.springframework.web.filter.OncePerRequestFilter#doFilterInternal(

* javax.servlet.http.HttpServletRequest,

* javax.servlet.http.HttpServletResponse, javax.servlet.FilterChain)

*/

@Override

protected void doFilterInternal(HttpServletRequest request,

HttpServletResponse response, FilterChain filterChain)

throws ServletException, IOException {

// 不过滤的uri

String[] notFilter = new String[] { "login.html", "index.html" };

// 请求的uri

String uri = request.getRequestURI();

// uri中包含background时才进行过滤

if (uri.indexOf("background") != -1) {

// 是否过滤

boolean doFilter = true;

for (String s : notFilter) {

if (uri.indexOf(s) != -1) {

// 如果uri中包含不过滤的uri，则不进行过滤

doFilter = false;

break;

}

}

if (doFilter) {

// 执行过滤

// 从session中获取登录者实体

Object obj = request.getSession().getAttribute("loginedUser");

if (null == obj) {

// 如果session中不存在登录者实体，则弹出框提示重新登录

// 设置request和response的字符集，防止乱码

request.setCharacterEncoding("UTF-8");

response.setCharacterEncoding("UTF-8");

PrintWriter out = response.getWriter();

String loginPage = "....";

StringBuilder builder = new StringBuilder();

builder.append("<script type=\"text/javascript\">");

builder.append("alert('网页过期，请重新登录！');");

builder.append("window.top.location.href='");

builder.append(loginPage);

builder.append("';");

builder.append("</script>");

out.print(builder.toString());

} else {

// 如果session中存在登录者实体，则继续

filterChain.doFilter(request, response);

}

} else {

// 如果不执行过滤，则继续

filterChain.doFilter(request, response);

}

} else {

// 如果uri中不包含background，则继续

filterChain.doFilter(request, response);

}

}

}

1

2

3

4

5

6

7

8

<filter>

<filter-name>sessionFilter</filter-name>

<filter-class>com.test.spring.filter.SessionFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>sessionFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>