1. Overview

1.概述

In this quick tutorial, we’ll discuss the difference between getRequestURI() and getPathInfo() in the HttpServletRequest class.

在这个快速教程中，我们将讨论getRequestURI()和getPathInfo()在HttpServletRequest类中的区别。

2. Difference Between getRequestURI() and getPathInfo()

**2.getRequestURI()和getPathInfo()之间的区别**

The function getRequestURI() returns the complete requested URI. This includes the deployment folder and servlet-mapping string. It will also return all extra path information.

函数getRequestURI() 返回完整的请求URI。这包括部署文件夹和servlet-mapping字符串。它还将返回所有额外的路径信息。

The function getPathInfo() only returns the path passed to the servlet. If there is no extra path information passed, this function will return null.

函数getPathInfo()只返回传递给Servlet的路径。如果没有传递额外的路径信息，该函数将返回null。

In other words, if we deploy our application in our web server’s root, and we request the servlet mapped to “/”, both getRequestURI() and getPathInfo() will return the same string. Otherwise, we’ll get different values.

换句话说，如果我们在Web服务器的根部部署我们的应用程序，并且我们请求映射到”/”的servlet，getRequestURI()和getPathInfo()都将返回相同的字符串g。否则，我们会得到不同的值。

3. Example Request

3.请求示例

In order to get a better understanding of the HttpServletRequest methods, let’s say we have a servlet which can be accessed via this URL:

为了更好地理解HttpServletRequest方法，假设我们有一个servlet，可以通过这个URL访问。

http://localhost:8080/deploy-folder/servlet-mapping

This request will hit the “servlet-mapping” servlet in a web application deployed inside “deploy-folder”. Therefore, if we call getRequestURI() and getPathInfo() for this request, they will return different strings.

这个请求将击中部署在 “deploy-folder “中的Web应用程序中的 “servlet-mapping “小程序。因此，如果我们为这个请求调用getRequestURI()和getPathInfo()，它们将返回不同的字符串。

Let’s create a simple doGet() servlet method:

让我们创建一个简单的doGet()Servlet方法。

public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
    PrintWriter writer = response.getWriter();
    if ("getPathInfo".equals(request.getParameter("function")) {
        writer.println(request.getPathInfo());
    } else if ("getRequestURI".equals(request.getParameter("function")) {
        writer.println(request.getRequestURI());
    }
    writer.flush();
}

Firstly, let’s take a look at the output of the servlet for getRequestURI requests fetched by curl command:

首先，让我们看看Servlet对curl命令获取的getRequestURI请求的输出。

curl http://localhost:8080/deploy-folder/servlet-mapping/request-path?function=getRequestURI

/deploy-folder/servlet-mapping/request-path

Similarly, let’s take a look at the output of the servlet for getPathInfo:

同样地，让我们看看Servlet对getPathInfo的输出。

curl http://localhost:8080/deploy-folder/servlet-mapping/request-path?function=getPathInfo

/request-path

4. Conclusion

4.结论

In this article, we’ve explained the difference between getRequestURI() and getPathInfo() in HttpServletRequest. We also demonstrated it with an example servlet and request.

在这篇文章中，我们已经解释了HttpServletRequest中的getRequestURI()和getPathInfo()之间的区别。我们还用一个Servlet和请求的例子进行了演示。

As always, the servlet implemented to test all these functions is available over on Github.

一如既往，为测试所有这些功能而实施的Servlet可在Github上获取。