Java WEB開發亂碼問題
一.Servlet亂碼問題的解決
利用filter和request.getParamter()方法即可解決,直接上代碼
1.CodeFilter:過濾器攔截所有請求
public class CodeFilter implements Filter{
@Override
public void destroy() {}
@Override
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request =(HttpServletRequest) req;
String method =request.getMethod().toLowerCase();
if("post".equals(method)){
request.setCharacterEncoding("UTF-8");
}else{
request=new MyHttpservletrequest(request);
}
chain.doFilter(request, resp);
}
@Override
public void init(FilterConfig arg0) throws ServletException {}
}
2.MyHttpservletrequest:重寫getParamter()方法
public class MyHttpservletrequest extends HttpServletRequestWrapper{
public MyHttpservletrequest(HttpServletRequest request) {
super(request);
}
@Override
public String getParameter(String name) {
String value=name;
if(value!=null){
try {
value =new String(super.getParameter(value).getBytes("ISO-8859-1"),"UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
return value;
}
}
二.struts2解決亂碼問題
與servlet解決亂碼類似,只是struts2通過getParamterMap()獲取參數,所以要重寫getParamterMap()方法
1.EncodingFilter
//繼承Struts默認的過濾器:StrutsPrepareAndExecuteFilter
public class EncodingFilter extends StrutsPrepareAndExecuteFilter {
@Override
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
if(request.getMethod().equalsIgnoreCase("get")){
request = new MyHttpRequest(request);
}
request.setCharacterEncoding("UTF-8");
super.doFilter(request, resp, chain);
}
}
2.重寫getparamterMap()的request:MyHttpRequest
public class MyHttpRequest extends HttpServletRequestWrapper {
public MyHttpRequest(HttpServletRequest request) {
super(request);
}
//struts內部使用getparameterMap()獲取請求參數
/**
* 重寫getParameterMap()方法
*/
@Override
public Map<String, String[]> getParameterMap() {
Map<String, String[]> map = super.getParameterMap();
Map<String, String[]> nMap = new HashMap<String, String[]>();
String[] value = null;
for (String key : map.keySet()) {
value = new String[map.get(key).length];
for (int i = 0; i < map.get(key).length; i++) {
try {
value[i] = new String(
map.get(key)[i].getBytes("ISO-8859-1"), "utf-8");
nMap.put(key, value);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
}
return nMap;
}
}
三.SpringMVC解決亂碼:
SpringMVC通過getParamterValues()獲取參數,所以要重寫getParamterValues()方法
1.MyEncodingFilter
public class MyEncodingFilter extends CharacterEncodingFilter{
@Override
protected void doFilterInternal(HttpServletRequest request,
HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
if(request.getMethod().equalsIgnoreCase("post")){
super.setEncoding("utf-8");
}else if(request.getMethod().toLowerCase().equalsIgnoreCase("get")){
request = new MyHttpRequest(request);
}
super.doFilterInternal(request, response, filterChain);
}
}
2.MyHttpRequest :負責重寫getPramterValues()方法
//springMVC 獲取前臺參數用:getParamterValues
public class MyHttpRequest extends HttpServletRequestWrapper {
private HttpServletRequest request;
public MyHttpRequest(HttpServletRequest request) {
super(request);
this.request = request;
}
@Override
public String[] getParameterValues(String name) {
String value = name;
String[] reqestValue = new String[] { "" };
if (value == null) {
return super.getParameterValues(value);
} else {
reqestValue = request.getParameterValues(name);
for (int i = 0; i < reqestValue.length; i++) {
try {
String str = new String(
reqestValue[i].getBytes("iso8859-1"), "utf-8");
reqestValue[i] = str;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
return reqestValue;
}
}
}
以上就是Java web開發常遇到的亂碼的問題的解決方案,不對的地方請大家指正