分享程序员开发的那些事...
更新时间：2022-09-08 21:33:17
环境：JDK1.7 TOMCAT7 spring3.2
1.过滤器代码
1.1基于spring过滤器
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.filter.OncePerRequestFilter;
public class SessionFilter extends OncePerRequestFilter {
@Override
protected void doFilterInternal(HttpServletRequest request,
HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
ParameterRequestWrapper requestWrapper = new ParameterRequestWrapper(request);
filterChain.doFilter(requestWrapper, response);
}
} |
1.2基于javax.servlet.Filter
Java代码
|
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
|
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
/** * Servlet Filter implementation class CommonFilter
*/
public class CommonFilter implements Filter {
/**
* Default constructor.
*/
public CommonFilter() {
// TODO Auto-generated constructor stub
}
/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
// place your code here
HttpServletRequest hr=(HttpServletRequest) request;
String url = hr.getServletPath().trim();
if (url.equals("xxx")){//不需要过滤的url，这里可以使用一个配置文件配置这些url，项目启动时读入内存一个map中，然后在这里进行判断
//我定义的是urlFilterMap，然后在这里urlFilterMap.containsValue(url)进行判断
chain.doFilter(hr, response);
}else{
ParameterRequestWrapper requestWrapper = new ParameterRequestWrapper((HttpServletRequest)request);
chain.doFilter(requestWrapper, response);
}
}
/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
}
} |
2.过滤器包装类 Java代码
|
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
|
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
public class ParameterRequestWrapper extends HttpServletRequestWrapper {
private Map<String , String[]> params = new HashMap<String, String[]>();
@SuppressWarnings("unchecked")
public ParameterRequestWrapper(HttpServletRequest request) {
// 将request交给父类，以便于调用对应方法的时候，将其输出，其实父亲类的实现方式和第一种new的方式类似
super(request);
//将参数表，赋予给当前的Map以便于持有request中的参数
this.params.putAll(request.getParameterMap());
this.modifyParameterValues();
}
//重载一个构造方法
public ParameterRequestWrapper(HttpServletRequest request , Map<String , Object> extendParams) {
this(request);
addAllParameters(extendParams);//这里将扩展参数写入参数表
}
public void modifyParameterValues(){//将parameter的值去除空格后重写回去
Set<String> set =params.keySet();
Iterator<String> it=set.iterator();
while(it.hasNext()){
String key= (String) it.next();
String[] values = params.get(key);
values[0] = values[0].trim();
params.put(key, values);
}
}
@Override
public String getParameter(String name) {//重写getParameter，代表参数从当前类中的map获取
String[]values = params.get(name);
if(values == null || values.length == 0) {
return null;
}
return values[0];
}
public String[] getParameterValues(String name) {//同上
return params.get(name);
}
public void addAllParameters(Map<String , Object>otherParams) {//增加多个参数
for(Map.Entry<String , Object>entry : otherParams.entrySet()) {
addParameter(entry.getKey() , entry.getValue());
}
}
public void addParameter(String name , Object value) {//增加参数
if(value != null) {
if(value instanceof String[]) {
params.put(name , (String[])value);
}else if(value instanceof String) {
params.put(name , new String[] {(String)value});
}else {
params.put(name , new String[] {String.valueOf(value)});
}
}
}
} |
3.web.xml配置
3.1 基于spring 配置
|
1
2
3
4
5
6
7
8
|
<filter> <filter-name>sessionFilter</filter-name>
<filter-class>com.cnpc.oms.common.service.SessionFilter</filter-class>
</filter><filter-mapping> <filter-name>sessionFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> |
3.2基于javax.serlvet.Filter
|
1
2
3
4
5
6
7
8
|
<filter>
<filter-name>commonFilter</filter-name>
<filter-class>com.cnpc.oms.common.service.CommonFilter</filter-class>
</filter><filter-mapping> <filter-name>commonFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> |
参考：http://zhangzhaoaaa.iteye.com/blog/1853787
本文转自yunlielai51CTO博客，原文链接：http://blog.51cto.com/4925054/1942490，如需转载请自行联系原作者