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@RequestBody的使用及二维码的生成

2020-02-16 21:26 447 查看

@RequestBody主要用来接收前端传给后端的json字符串中的数据(请求体中的数据),GET没有请求体,所有用@RequestBody接收数据时,需要使用POST方式提交。

这里写了一个小demo(生成二维码),通过@RequestBody接收前端传来的json格式的字符串。

前端主要代码:

<form >
请支付0.01元,你就能用手机扫码百度了! &nbsp; &nbsp; &nbsp; &nbsp;
<input id="price" name="price" type="hidden" value="0.01"/>
<input type="button" value="确定" onclick="zhifu()">   <!-- 如果type用submit,点击确定后会刷新页面 -->
<div id="result">
<img src="http://192.168.17.212:8081/uploadfile/weixinzhifu.png" id="qrcode" width="200px" height="250px"/>
</div>
</form>

AJAX请求:

<script>
function zhifu(){
var price=$("#price").val();
console.log(price);
var data1={price:price};
$.ajax({
type:"post",
url:"${pageContext.request.contextPath}/blogs/getwxPayCode",
//data:{price:price},  //注释报400  price:"0.01"
data: JSON.stringify(data1),  //{price:"0.01"}  转成json格式
cache:false,
dataType:'json',
contentType : "application/json",   //注释   报415
success:function(data){
var photoUrl=data.photoUrl;
console.log(data);
console.log(data.photoUrl);
$("#qrcode").attr("src",photoUrl);
$("#qrcode").attr("height","200px");
},
error:function(){
alert("异常");
}
});
}
</script>

后端代码:

/**
* 给前台返回二维码 @RequestBody:接收前台传的json字符串,请求方式要为POST
*
* @param json
* @return
*/
@RequestMapping("getwxPayCode")
@ResponseBody
public JSON getwxPayCode(@RequestBody JSONObject json) {
JSONObject jsonObject = new JSONObject();
try {
jsonObject.put("price", json.get("price"));
String imgPath = configUtil.getImgPath();
String uploadPath = imgPath.substring(imgPath.indexOf(":") + 1); // D:/image/
String wxPayUrl = "https://www.baidu.com";
String filename = new Random().nextInt(99999999) + ".jpg";  //八位随机数文件名
QRCodeUtil.encode(wxPayUrl, uploadPath + "wxPay/" + filename);
//获取电脑IP,用于获取图片,图片路径映射前面博客有讲
String ip = InetAddress.getLocalHost().getHostAddress();
String port = configUtil.getPort();
//http://192.168.17.212:8081/uploadfile/wxPay/40823272.jpg
String photoUrl = "http://" + ip + ":" + port + "/uploadfile/wxPay/" + filename;
jsonObject.put("photoUrl", photoUrl);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return jsonObject;
}

生成二维码的工具类:

public class QRCodeUtil {

private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int WIDTH = 60;
// LOGO高度
private static final int HEIGHT = 60;

/**
* 生成二维码的图片
*
* @param content
* @param imgPath
* @param needCompress
* @return
* @throws Exception
*/
private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
// 如果不写或者为null则返回一个没有嵌入图片的纯净的二维码
if (imgPath == null || "".equals(imgPath)) {
return image;
}
// 插入图片
QRCodeUtil.insertImage(image, imgPath, needCompress);
return image;
}

/**
* 二维码中间插入图片
*
* @param source
* @param imgPath
* @param needCompress
* @throws Exception
*/
private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
File file = new File(imgPath);
if (!file.exists()) {
System.err.println("" + imgPath + "   该文件不存在!");
return;
}
Image src = ImageIO.read(new File(imgPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > WIDTH) {
width = WIDTH;
}
if (height > HEIGHT) {
height = HEIGHT;
}
Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.dispose();
src = image;
}
// 插入LOGO
Graphics2D graph = source.createGraphics();
int x = (QRCODE_SIZE - width) / 2;
int y = (QRCODE_SIZE - height) / 2;
graph.drawImage(src, x, y, width, height, null);
Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
}

/**
* 嵌入图片的二维码,imgPath为null时,不嵌入
*
* @param content
* @param imgPath
* @param destPath
* @param needCompress
* @throws Exception
*/
public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
mkdirs(destPath);
// String file = new Random().nextInt(99999999)+".jpg";
// ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
ImageIO.write(image, FORMAT_NAME, new File(destPath));
}

public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
return image;
}

public static void mkdirs(String destPath) {
File file = new File(destPath);
// 当文件夹不存在时,mkdirs会自动创建多层目录,区别于mkdir.(mkdir如果父目录不存在则会抛出异常)
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
}

public static void encode(String content, String imgPath, String destPath) throws Exception {
QRCodeUtil.encode(content, imgPath, destPath, false);
}

/**
* 内容,二维码路径,两个参数
*
* @param content
* @param destPath
* @throws Exception
*/
public static void encode(String content, String destPath) throws Exception {
// 生成二维码,true:表示将嵌入二维码的图片进行压缩,如果为“false”则表示不压缩。
QRCodeUtil.encode(content, null, destPath, false);
}

public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
ImageIO.write(image, FORMAT_NAME, output);
}

public static void encode(String content, OutputStream output) throws Exception {
QRCodeUtil.encode(content, null, output, false);
}

/**
* 获取二维码里面的数据
*
* @param file
* @return
* @throws Exception
*/
public static String decode(File file) throws Exception {
BufferedImage image;
image = ImageIO.read(file);
if (image == null) {
return null;
}
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
Hashtable hints = new Hashtable();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
String resultStr = result.getText();
return resultStr;
}

public static String decode(String path) throws Exception {
return QRCodeUtil.decode(new File(path));
}

public static void main(String[] args) throws Exception {
// 存放在二维码中的内容
JSONObject jsonObject = new JSONObject();
jsonObject.put("types", 4);
jsonObject.put("proCode", "360000");
jsonObject.put("province", "江西省");
jsonObject.put("city", "南昌市");
jsonObject.put("cityCode", "360100");
jsonObject.put("siName", "九江十九中");
jsonObject.put("siNumber", "7910001");
jsonObject.put("repetitionClass", 1);
String text = jsonObject.toJSONString();
System.out.println(text);
System.out.println(text.length());
// 根据时间戳获取二维码名字
long system = System.currentTimeMillis();
// String destPath = "D:/qrCode/qrcode/" + system + ".jpg";
String destPath = "D:/qrCode/qrcode/test.jpg";
QRCodeUtil.encode(text, destPath);
// 解析二维码
String str = QRCodeUtil.decode(destPath);
// 打印出解析出的内容
System.out.println(str);
}

/**
* 测试有嵌入图片的二维码,二维码放地址
*
* @throws Exception
*/
@Test
public void test1() throws Exception {
// 要加上http://,不然会看成字符串
String juzhiyuan = "http://www.baidu.com";
// 要嵌入二维码的图片路径,如果不写或者为null则生成一个没有嵌入图片的纯净的二维码
String imgPath = "D:/qrCode/baidu.jpg"; //嵌入的图片
String destPath = "D:/qrCode/qrcode/baidu.jpg";
// 生成中间有图片的二维码
QRCodeUtil.encode(juzhiyuan, imgPath, destPath, true);
// 解析二维码,true:对嵌入的图片进行压缩
String str = QRCodeUtil.decode(destPath);
// 打印出解析出的内容
System.out.println(str);
}

/**
* 生成包含内容的二维码
*
* @throws Exception
*/
@Test
public void test2() throws Exception {
// 存放在二维码中的内容
JSONObject jsonObject = new JSONObject();
jsonObject.put("types", 4);
jsonObject.put("proCode", "360000");
jsonObject.put("province", "江西省");
jsonObject.put("city", "南昌市");
jsonObject.put("cityCode", "360100");
jsonObject.put("siName", "九江十九中");
jsonObject.put("siNumber", "7910001");
jsonObject.put("repetitionClass", 1);
String text = jsonObject.toJSONString();
System.out.println(text);
System.out.println(text.length());
// 根据时间戳获取二维码名字
// long system = System.currentTimeMillis();
// String destPath = "D:/qrCode/qrcode/" + system + ".jpg";
String destPath = "D:/qrCode/qrcode/testlian.jpg";
QRCodeUtil.encode(text, destPath);
// 解析二维码
String str = QRCodeUtil.decode(destPath);
// 打印出解析出的内容
System.out.println(str);
}

@Test
public void test3() throws Exception {
String path = "C:/home/cloudfile/payImage/7585821.jpg";
String str = QRCodeUtil.decode(path); // 解析二维码
System.out.println(str);
}
}

示例:

点击确定后,如下图:

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