Java GET Request Parameters: Complete Guide

In Java, you can obtain GET request parameters using the getQueryString() method or the getParameter() method of the HttpServletRequest object.

1. Use the getQueryString() method:

// 获取HttpServletRequest对象
HttpServletRequest request = ...;

// 获取GET请求参数字符串
String queryString = request.getQueryString();

// 解析参数字符串
Map<String, String> params = new HashMap<>();
if (queryString != null) {
    String[] pairs = queryString.split("&");
    for (String pair : pairs) {
        String[] keyValue = pair.split("=");
        if (keyValue.length == 2) {
            params.put(keyValue[0], keyValue[1]);
        }
    }
}

// 获取参数值
String paramValue = params.get("paramName");

1. Using the getParameter() method:

// 获取HttpServletRequest对象
HttpServletRequest request = ...;

// 获取GET请求参数值
String paramValue = request.getParameter("paramName");

Note: The getParameter() method can only retrieve a single parameter value. If a parameter has multiple values, you can use the getParameterValues() method to retrieve all values of a parameter.