2018.12.1 web项目中解决乱码问题的一个工具类

<!-- 配置一个过滤器  编码格式的过滤器 -->

  <filter>

  	<filter-name>encodeFilter</filter-name>

  	<filter-class>com.glut.web.filter.GenericEncodingFilter</filter-class>

  </filter>

  <filter-mapping>

  	<filter-name>encodeFilter</filter-name>

  	<url-pattern>/*</url-pattern>

  </filter-mapping>

package com.glut.web.filter;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.Map;

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.HttpServletRequestWrapper;

/**

 * 解决乱码显示

 * @author qichunlin

 *

 */

public class GenericEncodingFilter implements Filter {

	@Override

	public void destroy() {

	}

	@Override

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

			throws IOException, ServletException {

		// 转型为与协议相关对象

		HttpServletRequest httpServletRequest = (HttpServletRequest) request;

		// 对request包装增强

		HttpServletRequest myrequest = new MyRequest(httpServletRequest);

		chain.doFilter(myrequest, response);

	}

	@Override

	public void init(FilterConfig filterConfig) throws ServletException {

	}

}

// 自定义request对象

class MyRequest extends HttpServletRequestWrapper {

	private HttpServletRequest request;

	private boolean hasEncode;

	public MyRequest(HttpServletRequest request) {

		super(request);// super必须写

		this.request = request;

	}

	// 对需要增强方法 进行覆盖

	@Override

	public Map getParameterMap() {

		// 先获得请求方式

		String method = request.getMethod();

		if (method.equalsIgnoreCase("post")) {

			// post请求

			try {

				// 处理post乱码

				request.setCharacterEncoding("utf-8");

				return request.getParameterMap();

			} catch (UnsupportedEncodingException e) {

				e.printStackTrace();

			}

		} else if (method.equalsIgnoreCase("get")) {

			// get请求

			Map<String, String[]> parameterMap = request.getParameterMap();

			if (!hasEncode) { // 确保get手动编码逻辑只运行一次

				for (String parameterName : parameterMap.keySet()) {

					String[] values = parameterMap.get(parameterName);

					if (values != null) {

						for (int i = 0; i < values.length; i++) {

							try {

								// 处理get乱码

								values[i] = new String(values[i].getBytes("ISO-8859-1"), "utf-8");

							} catch (UnsupportedEncodingException e) {

								e.printStackTrace();

							}

						}

					}

				}

				hasEncode = true;

			}

			return parameterMap;

		}

		return super.getParameterMap();

	}

	@Override

	public String getParameter(String name) {

		Map<String, String[]> parameterMap = getParameterMap();

		String[] values = parameterMap.get(name);

		if (values == null) {

			return null;

		}

		return values[0]; // 取回参数的第一个值

	}

	@Override

	public String[] getParameterValues(String name) {

		Map<String, String[]> parameterMap = getParameterMap();

		String[] values = parameterMap.get(name);

		return values;

	}

}

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2018.12.1 web项目中解决乱码问题的一个工具类

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