PlayFramework完整实现一个APP（七）

1.添加验证码

application Controller添加captcha()

public static void captcha() {
Images.Captcha captcha = Images.captcha();
renderBinary(captcha);
}

添加Route

GET /captcha Application.captcha

访问 http://localhost:9000/captcha

验证码图片已经实现了，现在需要做的是验证输入信息与验证码一致

修改captcha()方法

public static void captcha(String id) {
Images.Captcha captcha = Images.captcha();
String code = captcha.getText("#E4EAFD");
Cache.set(id, code, "10mn");
renderBinary(captcha);
}

修改show()方法

public static void show(Long id) {
Post post = Post.findById(id);
String randomID = Codec.UUID();
render(post, randomID);
}

修改show.html页面

在Comment下方添加验证码图片，和验证控件

<p>
<label for="content">Your message: </label>
<textarea name="content" id="content">${params.content}</textarea>
</p>
<p>
<label for="code">Please type the code below: </label>
<img src="@{Application.catcha(randomId)}">
<br />
<input type="text" name="code" id="code" size="18" value="" />
<input type="hidden" name="randomId" value="${randomId}" />
</p>
<p>
<input type="submit" value="Submit your comment" />
</p>

2.验证

修改postComment 方法

public static void postComment(
Long postId,
@Required(message="Author is required") String author,
@Required(message="A message is required") String content,
@Required(message="Please type the code") String code,
String randomId) {
Post post = Post.findById(postId);
validation.equals(code, Cache.get(randomId)).message("Invalid code. Please type it again");

if(validation.hasErrors()) {
render("Application/show.html", post);
}

post.addComment(author, content); Flash.success("Thanks for posting %s", author);
Cache.delete(randomId);
show(postId);
}

修改show.html页面

#{ifErrors}
<p class="error">
${errors[0]}
</p>
#{/ifErrors}

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