update java samples

Signed-off-by: wanjunlei <wanjunlei@kubesphere.io>

Author: wanjunlei

functions/async/java/cron-input-kafka-output/README.md

@@ -4,9 +4,9 @@
 
 You can refer to the [Installation Guide](https://openfunction.dev/docs/getting-started/installation/) to setup OpenFunction.
 
-Follow [this guide](../../../../Prerequisites.md#kafka) to install a Kafka server named `kafka-server` and a Topic named `sample-topic`.
+Follow [this guide](https://openfunction.dev/docs/getting-started/quickstarts/prerequisites/#kafka) to install a Kafka server named `kafka-server` and a Topic named `sample-topic`.
 
-Follow [this guide](../../../../Prerequisites.md#registry-credential) to create a registry credential.
+Follow [this guide](https://openfunction.dev/docs/getting-started/quickstarts/prerequisites/#registry-credential) to create a registry credential.
 
 ## Deployment
 

functions/async/java/pubsub/README.md

@@ -4,9 +4,9 @@
 
 You can refer to the [Installation Guide](https://openfunction.dev/docs/getting-started/installation/) to setup OpenFunction.
 
-Follow [this guide](../../../../Prerequisites.md#kafka) to install a Kafka server named `kafka-server` and a Topic named `sample-topic`.
+Follow [this guide](https://openfunction.dev/docs/getting-started/quickstarts/prerequisites/#kafka) to install a Kafka server named `kafka-server` and a Topic named `sample-topic`.
 
-Follow [this guide](../../../../Prerequisites.md#registry-credential) to create a registry credential.
+Follow [this guide](https://openfunction.dev/docs/getting-started/quickstarts/prerequisites/#registry-credential) to create a registry credential.
 
 ## Deployment
 

functions/knative/java/cloudevent/README.md

@@ -47,7 +47,7 @@ Send a request
 
 1. Create secret
 
-Follow [this guide](../../../../Prerequisites.md#registry-credential) to create a registry credential.
+Follow [this guide](https://openfunction.dev/docs/getting-started/quickstarts/prerequisites/#registry-credential) to create a registry credential.
 
 2. Create function
 

functions/knative/java/hello-world/README.md

@@ -31,7 +31,7 @@ Send a request
 
 1. Create secret
 
-Follow [this guide](../../../../Prerequisites.md#registry-credential) to create a registry credential.
+Follow [this guide](https://openfunction.dev/docs/getting-started/quickstarts/prerequisites/#registry-credential) to create a registry credential.
 
 2. Create function
 

functions/knative/java/with-output-binding/README.md

@@ -7,9 +7,9 @@ to the kafka after a HTTP request received. The `kafka-input` will watch the kaf
 
 You can refer to the [Installation Guide](https://openfunction.dev/docs/getting-started/installation/) to setup OpenFunction.
 
-Follow [this guide](../../../../Prerequisites.md#kafka) to install a Kafka server named `kafka-server` and a Topic named `sample-topic`.
+Follow [this guide](https://openfunction.dev/docs/getting-started/quickstarts/prerequisites/#kafka) to install a Kafka server named `kafka-server` and a Topic named `sample-topic`.
 
-Follow [this guide](../../../../Prerequisites.md#registry-credential) to create a registry credential.
+Follow [this guide](https://openfunction.dev/docs/getting-started/quickstarts/prerequisites/#registry-credential) to create a registry credential.
 
 ## Deployment