java 读取本地Json文件并返回到浏览器完整代码

在Java中，你可以使用`java.io`和`javax.json`包来读取本地JSON文件，并通过`Servlet`或`Spring MVC`将数据返回给浏览器。下面是一个简单的示例，展示了如何使用`FileReader`和`JsonReader`读取JSON文件，然后使用`HttpServletResponse`将其发送到浏览器：

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadJsonServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            // 读取本地JSON文件
            File jsonFile = new File("path/to/your/json/file.json");
            BufferedReader reader = new BufferedReader(new FileReader(jsonFile));
            StringBuilder jsonString = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                jsonString.append(line);
            }
            reader.close();

            // 将字符串转换为JSON对象
            JsonReader jsonReader = Json.createReader(new StringReader(jsonString.toString()));
            JsonObject jsonObject = jsonReader.readObject();

            // 设置响应内容类型
            response.setContentType("application/json");

            // 将JSON对象写入响应体
            response.getWriter().write(jsonObject.toJsonString());
        } catch (IOException | JsonException e) {
            e.printStackTrace();
            response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Failed to read JSON file");
        }
    }
}

这里假设你已经在项目中引入了`javax.json`库，如果没有，可以添加Maven依赖：

<dependency>
    <groupId>org.glassfish</groupId>
    <artifactId>javax.json</artifactId>
    <version>1.1.4</version>
</dependency>