一、配置一個過濾器,攔截全部請求
package cn.demo.filter;
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;
import javax.servlet.http.HttpServletResponse;
/**
* 全棧亂碼過濾器
*
*/
public class MyFilter implements Filter {
private String value;
private String type;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
value = filterConfig.getInitParameter("encoding");
type = filterConfig.getInitParameter("type");
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
// 強轉成子接口類型,使用更多api
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
HttpServletResponse httpServletResponse = (HttpServletResponse) response;
MyRequest myRequest = new MyRequest(httpServletRequest);// 構造方法注入,MyResquest中重寫三個方法,解決亂碼
httpServletResponse.setContentType(type + ";charSet=" + value);
chain.doFilter(myRequest, httpServletResponse);
}
@Override
public void destroy() {
}
}
web.xml配置
<display-name></display-name>
<filter>
<filter-name>MyFilter</filter-name>
<filter-class>cn.demo.filter.MyFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
<init-param>
<param-name>type</param-name>
<param-value>text/html</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<!-- 攔截全部請求,解決亂碼 -->
<url-pattern>/*</url-pattern>
</filter-mapping>
二、MyRequest類重寫三個方法
package cn.demo.filter;
import java.io.UnsupportedEncodingException;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
public class MyRequest extends HttpServletRequestWrapper {
private HttpServletRequest request;
private boolean flag = false;
public MyRequest(HttpServletRequest request) {
super(request);
this.request = request;
}
// 重寫三個方法
@Override
public Map getParameterMap() {
String method = request.getMethod();
if ("post".equalsIgnoreCase(method)) {
try {
request.setCharacterEncoding("utf-8");
return request.getParameterMap();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// 遍歷取出每一個元素,先編碼,再解碼
if ("get".equalsIgnoreCase(method)) {
if (!flag) {
Map<String, String[]> map = request.getParameterMap();
if (map != null && map.size() != 0) {
// 遍歷
for (String key : map.keySet()) {
String[] values = map.get(key);
if (values != null && values.length != 0) {
for (int i = 0; i < values.length; i++) {
try {
// 每個元素先編碼再解碼
values[i] = new String(values[i].getBytes("iso-8859-1"), "utf-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
flag = true;
return map;
}
}
return super.getParameterMap();
}
@Override
public String[] getParameterValues(String name) {
Map<String, String[]> map = getParameterMap();
if (map != null && map.size() != 0) {
String[] values = map.get(name);
if (values != null && values.length != 0) {
return values;
}
}
return super.getParameterValues(name);
}
@Override
public String getParameter(String name) {
Map<String, String[]> map = getParameterMap();
if (map != null && map.size() != 0) {
String[] values = map.get(name);
if (values != null && values.length != 0) {
return values[0];
}
}
return super.getParameter(name);
}
}