采用Servlet过滤器设置请求数据的字符编码的问题!

yuanjian0211 2005-10-17 06:46:03

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.UnavailableException;

/**
* Example filter that sets the character encoding to be used in parsing the
* incoming request
*/
public class SetCharacterEncodingFilter implements Filter {

/**
* Take this filter out of service.
*/
public void destroy() {
}
/**
* Select and set (if specified) the character encoding to be used to
* interpret request parameters for this request.
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)throws IOException, ServletException {

request.setCharacterEncoding("UTF-8");

// 传递控制到下一个过滤器
chain.doFilter(request, response);
}

public void init(FilterConfig filterConfig) throws ServletException {
}
}

编译时出现了14处错误:
D:\tools\Tomcat 5.0\webapps\npis\src\com\npis>javac SetCharacterEncodingFilter.j
ava
SetCharacterEncodingFilter.java:2: package javax.servlet does not exist
import javax.servlet.Filter;
^
SetCharacterEncodingFilter.java:3: package javax.servlet does not exist
import javax.servlet.FilterChain;
^
SetCharacterEncodingFilter.java:4: package javax.servlet does not exist
import javax.servlet.FilterConfig;
^
SetCharacterEncodingFilter.java:5: package javax.servlet does not exist
import javax.servlet.ServletException;
^
SetCharacterEncodingFilter.java:6: package javax.servlet does not exist
import javax.servlet.ServletRequest;
^
SetCharacterEncodingFilter.java:7: package javax.servlet does not exist
import javax.servlet.ServletResponse;
^
SetCharacterEncodingFilter.java:8: package javax.servlet does not exist
import javax.servlet.UnavailableException;
^
SetCharacterEncodingFilter.java:14: cannot resolve symbol
symbol : class Filter
location: class SetCharacterEncodingFilter
public class SetCharacterEncodingFilter implements Filter {
^
SetCharacterEncodingFilter.java:25: cannot resolve symbol
symbol : class ServletRequest
location: class SetCharacterEncodingFilter
public void doFilter(ServletRequest request, ServletResponse response,
^
SetCharacterEncodingFilter.java:25: cannot resolve symbol
symbol : class ServletResponse
location: class SetCharacterEncodingFilter
public void doFilter(ServletRequest request, ServletResponse response,
^
SetCharacterEncodingFilter.java:26: cannot resolve symbol
symbol : class FilterChain
location: class SetCharacterEncodingFilter
FilterChain chain)throws IOException, ServletException {
^
SetCharacterEncodingFilter.java:26: cannot resolve symbol
symbol : class ServletException
location: class SetCharacterEncodingFilter
FilterChain chain)throws IOException, ServletException {
^
SetCharacterEncodingFilter.java:34: cannot resolve symbol
symbol : class FilterConfig
location: class SetCharacterEncodingFilter
public void init(FilterConfig filterConfig) throws ServletException {
^
SetCharacterEncodingFilter.java:34: cannot resolve symbol
symbol : class ServletException
location: class SetCharacterEncodingFilter
public void init(FilterConfig filterConfig) throws ServletException {
^
14 errors
究竟还要包括哪些类进来才行呢?
请大虾指点迷津啊!

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