我正在尝试从以下位置重写 URL:
localhost:8080/sendEmail/newEmail.pdf?request_id=23456&emailAddress=
收件人:
localhost:8080/sendEmail/newEmail.pdf?request_id=23456
过滤器类代码和映射如下。我怎样才能完成这项任务? (非常感谢您提供示例答案)。
过滤器映射:
<filter>
<filter-name>RequestFilter</filter-name>
<filter-class>com.abc.ms.email.filter.RequestFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>RequestFilter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
</filter-mapping>
过滤代码:
public class RequestFilter implements Filter {
private static final Pattern REWRITE_PATTERN = Pattern.compile("(^[1-9]\\d*)$");
public void doFilter(ServletRequest req, ServletResponse res, FilterChain fc) throws IOException, ServletException {
HttpServletRequestWrapper wrapper = new HttpServletRequestWrapper((HttpServletRequest)req);
String url = wrapper.getRequestURL().toString();
String number = url.substring(url.lastIndexOf("/")).replace("/", "");
Matcher m = REWRITE_PATTERN.matcher(number);
if (m.find()) {
RequestDispatcher dispatcher = wrapper.getRequestDispatcher("request?id=" + m.group(1));
dispatcher.forward(req, res);
} else {
fc.doFilter(wrapper, res);
}
}
}
最佳答案
如果您真正需要的只是一个简单的 URL 清理,那么使用正则表达式或 URL 重写模块可能有点过头了。
一个完全简单的实现可能是这样的:
public class RequestFilter implements Filter {
private static final String LOOK_FOR = "sendEmail/newEmail.pdf";
private static final String REMOVE = "&emailAddress=";
public void doFilter(ServletRequest req, ServletResponse res, FilterChain fc) throws IOException, ServletException {
HttpServletRequestWrapper wrapper = new HttpServletRequestWrapper((HttpServletRequest)req);
String original = wrapper.getRequestURL().toString();
if(original.contains(LOOK_FOR)) {
String filtered = StringUtils.substringBeforeLast(original, REMOVE);
RequestDispatcher dispatcher = wrapper.getRequestDispatcher(filtered);
dispatcher.forward(req, res);
} else {
fc.doFilter(wrapper, res);
}
}
}
使用 org.springframework.mock.web.*
类可以轻松进行单元测试:
public class RequestFilterTest {
private RequestFilter filter;
@Before
public void setUp() {
filter = new RequestFilter();
}
@Test
public void testRedirect() throws IOException, ServletException {
MockHttpServletRequest request = new MockHttpServletRequest("GET",
"/sendEmail/newEmail.pdf?request_id=23456&emailAddress=");
MockHttpServletResponse response = new MockHttpServletResponse();
MockFilterChain fc = new MockFilterChain();
filter.doFilter(request , response, fc);
Assert.assertEquals("http://localhost:80/sendEmail/newEmail.pdf?request_id=23456", response.getForwardedUrl());
}
}
关于java - servlet 过滤器重写 URL,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15648437/