我曾经使用“ @RequestParam（” ab“）String foo”从http查询中接收“ ab”参数。

现在我想切换到命令对象，但是我不知道如何接收此参数，我尝试使用以下4种形式“ ab”，“ aB”，“ a_b”，“ a_B”，但均无效，例如，以下代码将作为

网址：http：// localhost：8080 / test1？ab = 1
结果：Foo{ab='null', aB='null', a_b='null', a_B='null'}

提前致谢

@Controller
public class TestController {

@RequestMapping("/test1")
public String test1(
    Foo foo,
    HttpServletResponse response
) throws IOException {
    response.setContentType("text/plain");
    response.getOutputStream().write(foo.toString().getBytes("UTF-8"));
    return null;
}


public static class Foo {

    private String ab;
    private String aB;
    private String a_b;
    private String a_B;

    // getter and setter
    ...

    @Override
    public String toString() {
        return "Foo{" +
                "ab='" + ab + '\'' +
                ", aB='" + aB + '\'' +
                ", a_b='" + a_b + '\'' +
                ", a_B='" + a_B + '\'' +
                '}';
    }
}





}