使用Filter和包装模式解决request/response乱码问题

悠悠 2022-07-26 04:11 65阅读 0赞

`package` `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;`

`import` `javax.servlet.http.HttpServletResponse;`

`/**`

` ` `* 使用此过滤器解决reqeust/response乱码问题`

` ` `* @author 马隆博`

` ` `*/`

`public` `class` `CharacterFilter` `implements` `Filter {`

`    ` `@Override`

`    ` `public` `void` `init(FilterConfig fConfig)` `throws` `ServletException {}`

`    ` `@Override`

`    ` `public` `void` `doFilter(ServletRequest req, ServletResponse resp,`

`            ` `FilterChain chain)` `throws` `IOException, ServletException {`

`        ` `HttpServletRequest request = (HttpServletRequest) req;`

`        ` `HttpServletResponse response = (HttpServletResponse) resp;`

`        ` `req.setCharacterEncoding(` `"utf-8"` `);` `// 解决request乱码`

`        ` `resp.setContentType(` `"text/html;charset=utf-8"` `);` `// 解决response乱码`

`        ` `if` `(` `"get"` `.equalsIgnoreCase(request.getMethod())) {`

`            ` `CharacterRequest characterRequest =` `new` `CharacterRequest(request);` `// 使用包装的request`

`            ` `chain.doFilter(characterRequest, response);` `// 放行`

`            ` `return` `;`

`        ` `}`

`        ` `doFilter(request, response, chain);`

`    ` `}`

`    ` `@Override`

`    ` `public` `void` `destroy() {}`

`}`

`/**`

` ` `* 包装后的Request`

` ` `* @author 马隆博`

` ` `*/`

`class` `CharacterRequest` `extends` `HttpServletRequestWrapper {`

`    ` `public` `CharacterRequest(HttpServletRequest request) {`

`        ` `super` `(request);`

`    ` `}`

`    ` `@SuppressWarnings` `(` `"finally"` `)`

`    ` `private` `String convertCharacter(String value) {`

`        ` `String resultValue = value;`

`        ` `try` `{`

`            ` `resultValue =` `new` `String(value.getBytes(` `"ISO-8859-1"` `),` `"utf-8"` `);` `//转换为utf-8`

`        ` `}` `catch` `(UnsupportedEncodingException e) {`

`            ` `e.printStackTrace();`

`        ` `}` `finally` `{`

`            ` `return` `resultValue;`

`        ` `}`

`    ` `}`

`    ` `@Override`

`    ` `public` `String getParameter(String name) {`

`        ` `String value =` `super` `.getParameter(name);` `// 调用被包装对象的方法`

`        ` `if` `(value !=` `null` `){`

`            ` `value = convertCharacter(value);` `//转换字符`

`        ` `}`

`        ` `return` `value;`

`    ` `}`

`    ` `@Override`

`    ` `public` `Map<String, String[]> getParameterMap() {`

`        ` `Map<String, String[]> map =` `super` `.getParameterMap();`

`        ` `if` `(map !=` `null` `) {`

`            ` `// 遍历转换字符`

`            ` `for` `(String[] values : map.values()) {`

`                ` `for` `(String value : values) {`

`                    ` `value = convertCharacter(value);`

`                ` `}`

`            ` `}`

`        ` `}`

`        ` `return` `map;`

`    ` `}`

`    ` `@Override`

`    ` `public` `String[] getParameterValues(String name) {`

`        ` `String[] values =` `super` `.getParameterValues(name);`

`        ` `if` `(values !=` `null` `) {`

`            ` `// 遍历转换字符`

`            ` `for` `(String value : values) {`

`                ` `value = convertCharacter(value);`

`            ` `}`

`        ` `}`

`        ` `return` `values;`

`    ` `}`

`}`

使用Filter和包装模式解决request/response乱码问题

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