环境:JDK1.7 TOMCAT7 spring3.2
1.过滤器代码
1.1基于spring过滤器
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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);
}
}
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1.2基于javax.servlet.Filter
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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
}
}
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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)});
}
}
}
}
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3.web.xml配置
3.1 基于spring 配置
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<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>
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3.2基于javax.serlvet.Filter
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<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>
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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