Java
javaTutorial
When the front-end passes data to the back-end, the back-end displays that the obtained data is NULL. How to solve it?
When the front-end passes data to the back-end, the back-end displays that the obtained data is NULL. How to solve it?
Apr 19, 2025 pm 09:15 PM
Problem Description: During the development process of using the Ruoyi separate framework, the front-end uses POST request to pass data to the back-end, but the back-end receives a NULL value.
Front-end code:
//Modify the order status export function updateorderstatus(id,status){
const data={
id,
status
}
return request({
url:"/business/orderinfo/updatestate",
method:"post",
data:data
})
}
Screenshot of front-end request data: (Screenshot of front-end request data should be included here)
Backend code (original code):
@ApiOperation("Order Management-Modify Order Status")
@ApiImplicitParams({
@ApiImplicitParam(name="id", value = "primary key id", required = true, dataType = "integer"),
@ApiImplicitParam(name="status", value = "Status 0 ends with 1", required = true, dataType = "integer")
})
@PostMapping("/updatestate")
public AjaxResult updateState(Integer id, Integer status) {
System.out.println("Change Order Number: "id "\n");
System.out.println("Change order status: " status "\n");
// ... (Other code)
}
Screenshot of backend printing results: (This should include screenshots of backend printing results, showing id and status as null)
Problem analysis: The backend uses Integer id, Integer status to receive parameters. When processing POST requests, Spring Boot cannot correctly parse JSON data in the request body to these parameters by default.
Solution: Modify the backend code and bind the JSON data in the request body to an object using the @RequestBody annotation.
Modified backend code:
@ApiOperation("Order Management-Modify Order Status")
@PostMapping("/updatestate")
public AjaxResult updateState(@RequestBody OrderStatusDTO orderStatusDTO) {
System.out.println("Change Order Number:" orderStatusDTO.getId() "\n");
System.out.println("Change order status:" orderStatusDTO.getStatus() "\n");
if (orderStatusDTO.getId() == null) {
return AjaxResult.error("enter primary key id");
}
if (orderStatusDTO.getStatus() == null) {
return AjaxResult.error("Input Status");
}
BorderInfo borderInfo = new BorderInfo();
borderInfo.setId(orderStatusDTO.getId());
borderInfo.setStatus(orderStatusDTO.getStatus());
System.out.println("Change order status:" borderInfo.toString() "\n");
orderInfoService.update(borderInfo);
return AjaxResult.success();
}
Added OrderStatusDTO class:
public class OrderStatusDTO {
private Integer id;
private Integer status;
// getters and setters
}
By using @RequestBody annotation and creating an OrderStatusDTO class to receive the JSON data passed by the front end, the backend can correctly parse the data to avoid the problem of NULL values. Please make sure that the JSON data sent by the front end is consistent with the field name of OrderStatusDTO . At the same time, check whether the front-end request function has correctly set headers , such as Content-Type: application/json .
This solution is more in line with the design specifications of the RESTful API than the original @RequestParam solution, and also processes the body data of POST requests more clearly.
The above is the detailed content of When the front-end passes data to the back-end, the back-end displays that the obtained data is NULL. How to solve it?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
What is Ethereum? What are the ways to obtain Ethereum ETH?
Jul 31, 2025 pm 11:00 PM
Ethereum is a decentralized application platform based on smart contracts, and its native token ETH can be obtained in a variety of ways. 1. Register an account through centralized platforms such as Binance and Ouyiok, complete KYC certification and purchase ETH with stablecoins; 2. Connect to digital storage through decentralized platforms, and directly exchange ETH with stablecoins or other tokens; 3. Participate in network pledge, and you can choose independent pledge (requires 32 ETH), liquid pledge services or one-click pledge on the centralized platform to obtain rewards; 4. Earn ETH by providing services to Web3 projects, completing tasks or obtaining airdrops. It is recommended that beginners start from mainstream centralized platforms, gradually transition to decentralized methods, and always attach importance to asset security and independent research, to
How to choose a free market website in the currency circle? The most comprehensive review in 2025
Jul 29, 2025 pm 06:36 PM
The most suitable tools for querying stablecoin markets in 2025 are: 1. Binance, with authoritative data and rich trading pairs, and integrated TradingView charts suitable for technical analysis; 2. Ouyi, with clear interface and strong functional integration, and supports one-stop operation of Web3 accounts and DeFi; 3. CoinMarketCap, with many currencies, and the stablecoin sector can view market value rankings and deans; 4. CoinGecko, with comprehensive data dimensions, provides trust scores and community activity indicators, and has a neutral position; 5. Huobi (HTX), with stable market conditions and friendly operations, suitable for mainstream asset inquiries; 6. Gate.io, with the fastest collection of new coins and niche currencies, and is the first choice for projects to explore potential; 7. Tra
Ethena treasury strategy: the rise of the third empire of stablecoin
Jul 30, 2025 pm 08:12 PM
The real use of battle royale in the dual currency system has not yet happened. Conclusion In August 2023, the MakerDAO ecological lending protocol Spark gave an annualized return of $DAI8%. Then Sun Chi entered in batches, investing a total of 230,000 $stETH, accounting for more than 15% of Spark's deposits, forcing MakerDAO to make an emergency proposal to lower the interest rate to 5%. MakerDAO's original intention was to "subsidize" the usage rate of $DAI, almost becoming Justin Sun's Solo Yield. July 2025, Ethe
What is Binance Treehouse (TREE Coin)? Overview of the upcoming Treehouse project, analysis of token economy and future development
Jul 30, 2025 pm 10:03 PM
What is Treehouse(TREE)? How does Treehouse (TREE) work? Treehouse Products tETHDOR - Decentralized Quotation Rate GoNuts Points System Treehouse Highlights TREE Tokens and Token Economics Overview of the Third Quarter of 2025 Roadmap Development Team, Investors and Partners Treehouse Founding Team Investment Fund Partner Summary As DeFi continues to expand, the demand for fixed income products is growing, and its role is similar to the role of bonds in traditional financial markets. However, building on blockchain
Ethereum (ETH) NFT sold nearly $160 million in seven days, and lenders launched unsecured crypto loans with World ID
Jul 30, 2025 pm 10:06 PM
Table of Contents Crypto Market Panoramic Nugget Popular Token VINEVine (114.79%, Circular Market Value of US$144 million) ZORAZora (16.46%, Circular Market Value of US$290 million) NAVXNAVIProtocol (10.36%, Circular Market Value of US$35.7624 million) Alpha interprets the NFT sales on Ethereum chain in the past seven days, and CryptoPunks ranked first in the decentralized prover network Succinct launched the Succinct Foundation, which may be the token TGE
The 5 most popular free market websites in 2025 Summary of currency circle market websites
Jul 29, 2025 pm 06:39 PM
Binance App data is the most authoritative and millisecond real-time, suitable for users who need one-stop transactions and price query; 2. The Ouyi App interface is refreshing and supports Web3 account integration, and the simplified version is more friendly to users who only need to query prices; 3. As a third-party aggregation platform, CoinGecko can compare prices across exchanges and use lightweight, suitable for research and analysis, but weak real-time; 4. Huobi App has stable functions and wide user base, but insufficient innovation and market share has declined; 5. Gate.io provides rich stable currency types and emerging project data, which is powerful but has a crowded interface, making it difficult for novices to get started.
What is Huobi HTX red envelope? How to send and receive red envelopes? Huobi divides 1000U activities
Jul 30, 2025 pm 09:45 PM
Table of Contents 1. What is Huobi HTX red envelope? 2. How to create and send red envelopes? 3. How to receive red envelopes? 1. Receive password red envelopes 2. Scan the QR code to receive red envelopes 3. Click on the red envelope link to receive red envelopes 4. Check the red envelopes and share more instructions: 1. What is Huobi HTX red envelope? Huobi HTX red envelopes support users to send cryptocurrencies to friends in the form of red envelopes. You can create cryptocurrency red envelopes with random or fixed amounts, and send them to friends by sending red envelope passwords, sharing links or posters. Your friends can receive it for free in Huobi HTXAPP or click on the link. Huobi HTX red envelopes also support unregistered users to receive them, and
Solana and the founders of Base Coin start a debate: the content on Zora has 'basic value'
Jul 30, 2025 pm 09:24 PM
A verbal battle about the value of "creator tokens" swept across the crypto social circle. Base and Solana's two major public chain helmsmans had a rare head-on confrontation, and a fierce debate around ZORA and Pump.fun instantly ignited the discussion craze on CryptoTwitter. Where did this gunpowder-filled confrontation come from? Let's find out. Controversy broke out: The fuse of Sterling Crispin's attack on Zora was DelComplex researcher Sterling Crispin publicly bombarded Zora on social platforms. Zora is a social protocol on the Base chain, focusing on tokenizing user homepage and content
