Application.java播放框架中的重载方法

如何在Play项目的Application.java中设置重载方法

以下是我目前正在做的一些示例：

Application.java

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void getData() {
        renderText("Without Parameter");
    }

    public static void getData(String name) {
        renderText("With Parameter name = " + name);
    }
}

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void getData() {
        /** 
         *  Do some process before call getDataName method 
         *  and send the result of the process as the parameter.
         *  That's why I do this way that look like redundancy process.
        **/
        getDataName(null);
    }

    public static void getDataName(String name) {
        // Didn't use ternary operation here because will become error 'not a statement'
        if(name == null)
            renderText("Without Parameter");
        else
            renderText("With Parameter name = " + name);
    }

}

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void getData(String name, Integer age) {
        if (name == null && age == null) {
            renderText("Data null");
        } else if (name != null && age == null) {
            renderText("Name: " + name);
        } else if (name != null && age != null) {
            renderText("Name: " + name + "\n" + "Age: " + age);
        }
    }
}

路线

# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~

# Home page
GET     /                                       Application.index
GET     /data                                   Application.getData

# Ignore favicon requests
GET     /favicon.ico                            404

# Map static resources from the /app/public folder to the /public path
GET     /public/                                staticDir:public

# Catch all
*       /{controller}/{action}                  {controller}.{action}

GET     /                                       Application.index
GET     /default                                Application.getData
GET     /dataString                             Application.getDataName

GET     /data                                   Application.getData
GET     /data/{name}                            Application.getData
GET     /data/{name}/{age}                      Application.getData

测试：

调用

getData

，不带参数

http://localhost:9000/data

使用参数调用

getData

http://localhost:9000/data?name=test

结果：

参数名为null的

参数名为test的

我想要什么结果：

无参数

参数名为test的

非常感谢你的帮助。谢谢你

---

更新解决方案 以下是我根据建议所做的：

Application.java

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void getData() {
        renderText("Without Parameter");
    }

    public static void getData(String name) {
        renderText("With Parameter name = " + name);
    }
}

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void getData() {
        /** 
         *  Do some process before call getDataName method 
         *  and send the result of the process as the parameter.
         *  That's why I do this way that look like redundancy process.
        **/
        getDataName(null);
    }

    public static void getDataName(String name) {
        // Didn't use ternary operation here because will become error 'not a statement'
        if(name == null)
            renderText("Without Parameter");
        else
            renderText("With Parameter name = " + name);
    }

}

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void getData(String name, Integer age) {
        if (name == null && age == null) {
            renderText("Data null");
        } else if (name != null && age == null) {
            renderText("Name: " + name);
        } else if (name != null && age != null) {
            renderText("Name: " + name + "\n" + "Age: " + age);
        }
    }
}

路线

# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~

# Home page
GET     /                                       Application.index
GET     /data                                   Application.getData

# Ignore favicon requests
GET     /favicon.ico                            404

# Map static resources from the /app/public folder to the /public path
GET     /public/                                staticDir:public

# Catch all
*       /{controller}/{action}                  {controller}.{action}

GET     /                                       Application.index
GET     /default                                Application.getData
GET     /dataString                             Application.getDataName

GET     /data                                   Application.getData
GET     /data/{name}                            Application.getData
GET     /data/{name}/{age}                      Application.getData

---

更新解决方案（2007年7月26日） Application.java

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void getData() {
        renderText("Without Parameter");
    }

    public static void getData(String name) {
        renderText("With Parameter name = " + name);
    }
}

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void getData() {
        /** 
         *  Do some process before call getDataName method 
         *  and send the result of the process as the parameter.
         *  That's why I do this way that look like redundancy process.
        **/
        getDataName(null);
    }

    public static void getDataName(String name) {
        // Didn't use ternary operation here because will become error 'not a statement'
        if(name == null)
            renderText("Without Parameter");
        else
            renderText("With Parameter name = " + name);
    }

}

public class Application extends Controller {

    public static void index() {
        render();
    }

    public static void getData(String name, Integer age) {
        if (name == null && age == null) {
            renderText("Data null");
        } else if (name != null && age == null) {
            renderText("Name: " + name);
        } else if (name != null && age != null) {
            renderText("Name: " + name + "\n" + "Age: " + age);
        }
    }
}

路线

# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~

# Home page
GET     /                                       Application.index
GET     /data                                   Application.getData

# Ignore favicon requests
GET     /favicon.ico                            404

# Map static resources from the /app/public folder to the /public path
GET     /public/                                staticDir:public

# Catch all
*       /{controller}/{action}                  {controller}.{action}

GET     /                                       Application.index
GET     /default                                Application.getData
GET     /dataString                             Application.getDataName

GET     /data                                   Application.getData
GET     /data/{name}                            Application.getData
GET     /data/{name}/{age}                      Application.getData

至于电话：

 1. http://localhost:9000/data                -> Display "Data null"
 2. http://localhost:9000/data/Crazenezz      -> Display "Name: Crazenezz"
 3. http://localhost:9000/data/Crazenezz/24   -> Display "Name: Crazenezz
                                                          Age: 24"

---

我认为不可能像您希望的那样在routes文件中重载它

但你可以这样做：

public static void getData(String name) {
  if (name == null) {
    renderText("Without Parameter");
  } else {
    renderText("With Parameter name = " + name);
  }
}

---

我相信我想实现和你一样的目标，Crazenezz，所以首先我尝试了以下路线定义：

GET     /terms.json                 controllers.exposedjson.TermServiceJSON.findTermsByQuery(langId:Long ?= null)

。。。以及控制器中的一个方法，该方法检查参数是否为null，但该方法失败，因为

null

不是路由定义中的有效可选值。因此，我认为我将采用以下解决方案（到目前为止仍然有效），在JSON服务接口中公开一个字符串值，我将该值转换为控制器中的long

GET     /terms.json                 controllers.exposedjson.TermServiceJSON.findTermsByQuery(langId:String ?= "")


@Transactional(readOnly=true)
public static Result findTermsByQuery(String languageId) {
    Result result;
    if (languageId == "")
        result = ok(toJson(TermService.getTerms()));
    else
        result = ok(toJson(TermService.findTermsByLanguageId(Long.parseLong(languageId.trim()))));
    return result;
}

---

它不是很漂亮，但从服务客户端的角度来看，它可能比使用两个单独的路径要好。

感谢您的回答，让我们看看其他专家对此问题的看法。我尝试了许多方法，但没有找到其他可能的方法。因此，我选择使用您的样式：-）在我使用3重载方法尝试了您的建议之后，我发现参数

langId:Long？=null

没有真正的用处。它应该是这样写的

langId:'5'

，它是静态值，如果用户请求

/terms.json

而不带参数，它将传递

5

作为默认值。如果仍然使用上述配置，则可以检查命令提示符或终端，确保

langId:Long？=null为ignore

。首先，我认为这是我想要的，但是经过一次又一次的测试，我得到了另一个解决方案，请参阅上面我的更新解决方案。顺便说一句，不错的尝试…：）